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## #1 2012-06-22 07:03:41

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### My Prime Number, A challenge! Can you get next kind of this Prime?

What is the biggest Prime Number you can get by arranging consecutive prime numbers side by side? Few examples:

P1=2
P2=23
P3=2357
P4=2357111317192329313741434753596167717379838997101103107109113127131137139149151157163167173179181191193197199211223227229233239241251257263269271277281283293307311313317331337347349353359367373379383389397401409419421431433439443449457461463467479487491499503509521523541547557563569571577587593599601607613617619631641643647653659661673677683691701709719 (355 Digits) Hope I didn't miss any prime number in this sequence!

Can you get P5?

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## #2 2012-06-22 07:36:39

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Just found P5 (499 Digits).

P5=2357111317192329313741434753596167717379838997101103107109113127131137139149151157163167173179181191193197199211223227229233239241251257263269271277281283293307311313317331337347349353359367373379383389397401409419421431433439443449457461463467479487491499503509521523541547557563569571577587593599601607613617619631641643647653659661673677683691701709719727733739743751757761769773787797809811821823827829839853857859863877881883887907911919929937941947953967971977983991997100910131019102110311033

So, can someone find P6?

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## #3 2012-06-22 07:56:19

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,030

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

How do you know there aren't any in between? Have you checked them all?

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #4 2012-06-22 08:15:05

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

I did check them all but in case I missed any one of them, hope people can update it.

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## #5 2012-06-22 08:17:04

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,030

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

What did you use for checking?

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #6 2012-06-22 08:42:54

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

You can check them using ECPP http://www.ellipsa.eu/ (Primo) or ECM/SIQS/Rabin-Miller http://www.alpertron.com.ar/ECM.HTM

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## #7 2012-06-22 08:45:27

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,030

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Ok, I will see what I can do. How are you doing with finding P6?

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #8 2012-06-22 09:00:11

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

I think P6 would be having 800-1000 digits or even bigger. Would try finding it tomorrow.

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## #9 2012-06-22 09:08:25

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,030

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Ok, see you then.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #10 2012-06-22 13:18:30

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 108,676

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Hi;

P6 = 2357111317192329313741434753596167717379838997101103107109113127131137139149151157163167173179181191193197199211223227229233239241251257263269271277281283293307311313317331337347349353359367373379383389397401409419421431433439443449457461463467479487491499503509521523541547557563569571577587593599601607613617619631641643647653659661673677683691701709719727733739743751757761769773787797809811821823827829839853857859863877881883887907911919929937941947953967971977983991997100910131019102110311033103910491051106110631069108710911093109711031109111711231129115111531163117111811187119312011213121712231229123112371249125912771279128312891291129713011303130713191321132713611367137313811399140914231427142914331439144714511453145914711481148314871489149314991511152315311543154915531559156715711579158315971601160716091613161916211627163716571663166716691693169716991709172117231733174117471753175917771783178717891801181118231831184718611867187118731877187918891901190719131931193319491951197319791987199319971999200320112017202720292039205320632069208120832087208920992111211321292131213721412143215321612179220322072213222122372239224322512267226922732281228722932297

It has 1171 digits!

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #11 2012-06-22 15:20:35

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Kool Bobbyn:)..then P7 could be at least 2000-3000 Digits..I guess

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## #12 2012-06-22 16:50:05

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 108,676

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

If you need it I can get it.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Online

## #13 2012-06-22 18:12:19

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

P7=235711131719232931374143475359616771737983899710110310710911312713113713914915115716316717317918119119319719921122322722923323924125125726326927127728128329330731131331733133734734935335936737337938338939740140941942143143343944344945746146346747948749149950350952152354154755756356957157758759359960160761361761963164164364765365966167367768369170170971972773373974375175776176977378779780981182182382782983985385785986387788188388790791191992993794194795396797197798399199710091013101910211031103310391049105110611063106910871091109310971103
11091117112311291151115311631171118111871193120112131217122312291231123712491259127712791283128912911297130113031307131913211327136113671373138113991409142314271429143314391447145114531459147114811483148714891493149915111523153115431549155315591567157115791583159716011607160916131619162116271637165716631667166916931697169917091721172317331741174717531759177717831787178918011811182318311847186118671871187318771879188919011907191319311933194919511973197919871993199719992003201120172027202920392053
20632069208120832087208920992111211321292131213721412143215321612179220322072213222122372239224322512267226922732281228722932297230923112333233923412347235123572371237723812383238923932399241124172423243724412447245924672473247725032521253125392543254925512557257925912593260926172621263326472657265926632671267726832687268926932699270727112713271927292731274127492753276727772789279127972801280328192833283728432851285728612879288728972903290929172927293929532957296329692971299930013011301930233037

This number has 1543 Digits, ok Bobby, get me P8.

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## #14 2012-06-22 19:37:27

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 108,676

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

P8=2357111317192329313741434753596167717379838997101103107109113127131137139149151157163167173179181191193197199211223227229233239241251257263269271277281283293307311313317331337347349353359367373379383389397401409419421431433439443449457461463467479487491499503509521523541547557563569571577587593599601607613617619631641643647653659661673677683691701709719727733739743751757761769773787797809811821823827829839853857859863877881883887907911919929937941947953967971977983991997100910131019102110311033103910491051106110631069108710911093109711031109111711231129115111531163117111811187119312011213121712231229123112371249125912771279128312891291129713011303130713191321132713611367137313811399140914231427142914331439144714511453145914711481148314871489149314991511152315311543154915531559156715711579158315971601160716091613161916211627163716571663166716691693169716991709172117231733174117471753175917771783178717891801181118231831184718611867187118731877187918891901190719131931193319491951197319791987199319971999200320112017202720292039205320632069208120832087208920992111211321292131213721412143215321612179220322072213222122372239224322512267226922732281228722932297230923112333233923412347235123572371237723812383238923932399241124172423243724412447245924672473247725032521253125392543254925512557257925912593260926172621263326472657265926632671267726832687268926932699270727112713271927292731274127492753276727772789279127972801280328192833283728432851285728612879288728972903290929172927293929532957296329692971299930013011301930233037304130493061306730793083308931093119312131373163316731693181318731913203320932173221322932513253325732593271329933013307331333193323332933313343334733593361337133733389339134073413343334493457346134633467346934913499351135173527352935333539354135473557355935713581358335933607361336173623363136373643365936713673367736913697370137093719372737333739376137673769377937933797380338213823383338473851385338633877388138893907391139173919392339293931394339473967398940014003400740134019402140274049405140574073407940914093409941114127412941334139415341574159417742014211421742194229423142414243425342594261427142734283428942974327433743394349435743634373439143974409442144234441444744514457446344814483449345074513451745194523454745494561456745834591459746034621463746394643464946514657466346734679469147034721472347294733475147594783478747894793479948014813481748314861487148774889490349094919493149334937494349514957496749694973498749934999500350095011502150235039505150595077508150875099510151075113511951475153516751715179518951975209522752315233523752615273527952815297530353095323533353475351538153875393539954075413541754195431543754415443544954715477547954835501550355075519552155275531555755635569557355815591562356395641564756515653565756595669568356895693570157115717573757415743574957795783579158015807581358215827583958435849585158575861586758695879588158975903592359275939595359815987600760116029603760436047605360676073607960896091610161136121613161336143615161636173619761996203621162176221622962476257626362696271627762876299630163116317632363296337634363536359636163676373637963896397642164276449645164696473648164916521652965476551655365636569657165776581659966076619663766536659666166736679668966916701670367096719673367376761676367796781679167936803682368276829683368416857686368696871688368996907691169176947694969596961696769716977698369916997700170137019702770397043705770697079710371097121712771297151715971777187719372077211721372197229723772437247725372837297730773097321733173337349735173697393741174177433745174577459747774817487748974997507751775237529753775417547754975597561757375777583758975917603760776217639764376497669767376817687769176997703771777237727774177537757775977897793781778237829784178537867787378777879788379017907791979277933793779497951796379938009801180178039805380598069808180878089809381018111811781238147816181678171817981918209821982218231823382378243826382698273828782918293829783118317832983538363836983778387838984198423842984318443844784618467850185138521852785378539854385638573858185978599860986238627862986418647866386698677868186898693869987078713871987318737874187478753876187798783880388078819882188318837883988498861886388678887889389238929893389418951896389698971899990019007901190139029904190439049905990679091910391099127913391379151915791619173918191879199920392099221922792399241925792779281928392939311931993239337934193439349937193779391939794039413941994219431943394379439946194639467947394799491949795119521953395399547955195879601961396199623962996319643964996619677967996899697971997219733973997439749976797699781978797919803981198179829983398399851985798599871988398879901990799239929993199419949996799731000710009100371003910061100671006910079100911009310099101031011110133101391014110151101591016310169101771018110193102111022310243102471025310259102671027110273102891030110303103131032110331103331033710343103571036910391103991042710429104331045310457104591046310477104871049910501105131052910531105591056710589105971060110607106131062710631106391065110657106631066710687106911070910711107231072910733107391075310771107811078910799108311083710847108531085910861108671088310889108911090310909109371093910949109571097310979109871099311003110271104711057110591106911071110831108711093111131111711119111311114911159111611117111173111771119711213112391124311251112571126111273112791128711299113111131711321113291135111353113691138311393113991141111423114371144311447114671147111483114891149111497115031151911527115491155111579115871159311597116171162111633116571167711681116891169911701117171171911731117431177711779117831178911801118071181311821118271183111833118391186311867118871189711903119091192311927

5719 digits!

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Online

## #15 2012-06-22 23:41:16

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Hi anonimnystefy!

Can you get us P9?:)

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## #16 2012-06-22 23:44:04

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,030

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Maybe, if you gave me enough time.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #17 2012-06-24 06:13:48

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 108,676

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

You will need a lot of time. P(9) has more than 121444 digits.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Online

## #18 2012-06-24 06:51:07

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,030

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

It's not fair!

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #19 2012-06-24 09:49:43

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 108,676

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Why is it not fair? It is a lot better to know something about the size of problem you are given. Then you know whether or not to try it.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Online

## #20 2012-06-24 10:05:57

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,030

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

It is not fair because the next one is so large. I wanted to find one myself. Now I can't.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #21 2012-06-24 10:06:55

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 108,676

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

You could have found it.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Online

## #22 2012-06-24 14:00:31

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Don't give up anonimnystefy! The largest Prime nearly 13 million digits! 100k digits is not that big in comparison.

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## #23 2012-06-24 19:18:38

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 108,676

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

No one knows what P(9) is, the 100000+ digits is only a lower bound. It could be much more.
To verify the primality of each number takes a long time even using the fastest algorithms.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Online

## #24 2012-06-24 20:26:42

Stangerzv
Member
Registered: 2012-01-30
Posts: 243

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

I agree bobbym, sometimes the next prime just jumps into gigantic number out of blue. Sometimes they are just next to each other. You can never understand prime.

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## #25 2012-06-24 20:38:58

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 108,676

### Re: My Prime Number, A challenge! Can you get next kind of this Prime?

Hi;

Generally the primes thin out. It is natural to expect in this case that there would be big jumps each time.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Online