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#26 2013-01-23 08:06:38
- Primenumbers
- Novice
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Re: Prime Numbers!!
For prime numbers (p), under 3 squared; p = 2a + 1 (where a = any whole number)
For prime numbers (r), under 5 squared; r = 3p +/- 2 or 4
For prime numbers (i), under 7 squared; i = 5r +/- 6 or 12 or 18 or 24
For prime numbers (m), under 11 squared; m = 7i +/- 30 or 60 or 90 or 120 or 150 or 180
For prime numbers (e), under 13 squared; e = 11m +/- 210 or 420 or 630 or 840 or 1050 or 1260 or 1470 or 1680 or 1890 or 2100
(A no. divisible by a, but not divisible by a group b +/- A no. divisible by group b, but not a = A no. not divisible by a or b.)
* Some rules give 1 but this is not prime.
#27 2013-01-23 09:54:12
- anonimnystefy
- Real Member
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Re: Prime Numbers!!
Hi Primenumbers
Welcome to the forum! 
The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“A secret's worth depends on the people from whom it must be kept.” ― Carlos Ruiz Zafón
#28 2013-01-23 12:09:17
- bobbym
- Administrator
Online
Re: Prime Numbers!!
Hi Primenumbers;
Welcome to the forum!
In mathematics, you don't understand things. You just get used to them.
Probability is the most important concept in modern science, especially as nobody has the slightest notion what it means.
90% of mathematicians do not understand 90% of currently published mathematics.
#29 2013-01-26 11:02:14
- n872yt3r
- Power Member
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Re: Prime Numbers!!
Prime numbers are numbers that have no other factors then one and itself. One is not a prime number... 1x1=1 and 1/1=1.
x = prime
y = anything other than 1 and x
z = composite
a = decimal
x/1=x. x/x=1. x/y=a.
z/1=z. z/z=1. z/y=y.
For something else on prime numbers... go to my Sieve of Eratosthenes post.
- n872yt3r
Math Is Fun Rocks!
By the power of the exponent, I square and cube you!
