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## #101 2014-02-08 19:28:17

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

Okay.

69. p1+c2+p3...+c100=?

70. Is it prime?

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## #102 2014-02-08 22:44:55

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Prime Number Challenges

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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## #103 2014-02-10 21:15:27

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

Okay.

71. p47 - p46
72. p38 / p27

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## #104 2014-02-10 22:59:01

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Prime Number Challenges

Hi;

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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## #105 2014-02-12 21:18:01

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

73. p2^2
74. add the digits of #73

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## #106 2014-02-12 23:02:46

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Prime Number Challenges

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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## #107 2014-05-18 12:45:05

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

Correct!

# 75 squared

# 76 cubed

# 77 (sum of digits of #75) cubed

# 78 (sum of #76 and #77) raise to the fifth power

# 79 (sum of digits of #78) squared

# 80 Is (sum of digits of #75-79) prime?

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## #108 2014-05-18 12:59:39

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Prime Number Challenges

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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## #109 2014-05-18 13:25:19

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

# 81. to the four

# 82. prime?

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## #110 2014-05-18 13:28:18

ShivamS
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Registered: 2011-02-07
Posts: 3,648

### Re: Prime Number Challenges

Can you explain these a bit? I do not understand the questions.

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## #111 2014-05-18 13:32:36

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

Okay. I'm sorry, but:

#81. What is 81^4?

#82. Is (Sum of digits of 81^4) prime?

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## #112 2014-05-18 13:36:26

ShivamS
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## #113 2014-05-18 13:40:38

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

I mean sum of digits, like 4+3+0+4+6+7+2+1. Anyways, nice try!

I'll write the items more user friendly.

83. What is 3 to the 5?
84. Multiply that answer by itself.
85. Multiply it by the nth prime (let n be the answer to #83).

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## #114 2014-05-18 13:43:15

ShivamS
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Registered: 2011-02-07
Posts: 3,648

### Re: Prime Number Challenges

I missed the sum part, sorry. The question you asked in the last post was clear enough, thanks.

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## #115 2014-05-18 13:43:59

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Prime Number Challenges

Hi;

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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## #116 2014-05-18 13:45:21

ShivamS
Member
Registered: 2011-02-07
Posts: 3,648

### Re: Prime Number Challenges

Please hide your answers bobbym or you will receive an infraction.

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## #117 2014-05-18 13:47:30

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Prime Number Challenges

Sorry, latex error.

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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## #118 2014-05-18 14:01:31

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

It's okay. Time to sharpen our minds!

#86. 1+2+4+8+1+6+3+2+6+4+1+2+8...+1+0+4+8+5+7+6
#87. 1+3+9+2+7+8+1+2+4+3+7+2+9...+3+8+7+4+2+0+4+8+9
#88. 1+5+2+5+1+2+5+6+2+5+3+1+2+5...+9+7+6+5+6+2+5

Note: Give me the pattern first before the sum. Both in separate posts.

#89. Sum of digits of #86-88.

After solving for the sum of 86, 87 and 88, respectively, answer this in a separate post, again.

Last edited by mathaholic (2014-05-18 14:02:41)

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## #119 2014-05-27 22:33:50

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Prime Number Challenges

Hi;

I do not understand the questions please explain.

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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## #120 2014-05-28 01:27:26

ShivamS
Member
Registered: 2011-02-07
Posts: 3,648

### Re: Prime Number Challenges

Last edited by ShivamS (2014-05-28 01:27:46)

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## #121 2014-05-28 12:35:02

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

Hmm, since I'm too lazy to check...

#90. What is the square root of 121?

#91. It's obvious that it's prime. But, does the sum of its digits equal a prime number, too?

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## #122 2014-05-28 12:57:52

ShivamS
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Posts: 3,648

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## #123 2014-05-28 13:47:44

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,251

### Re: Prime Number Challenges

Whoops, I forgot to specify:

#91. Does the sum of the digits of the answer in #90 prime?

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## #124 2014-05-28 13:49:42

ShivamS
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Registered: 2011-02-07
Posts: 3,648

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## #125 2014-05-28 19:28:55

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Prime Number Challenges

Hi;

Should be #92

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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