20070711, 07:21  #1 
4660_{10} Posts 
there is another way to test the primality of a no
There is another way to test the primality of a no.If n be any number then if (n1)!+1 is divisible by n then n is a prime number

20070711, 11:37  #2 
"Nancy"
Aug 2002
Alexandria
100110100011_{2} Posts 
Moved to Misc. Math.
Alex 
20070712, 03:16  #3 
Feb 2006
Denmark
2·5·23 Posts 
Yes, and only if. This is Wilson's Theorem. It's computationally useless.

20070712, 15:54  #4 
∂^{2}ω=0
Sep 2002
República de California
5·2,351 Posts 
And the 2007 mfgoode Memorial Bronze Medal in Number Theory goes to the Thread Author, "For seminal work in the area of improved algorithmic efficiency in primality testing."
Shawn, PM me your snailmail address and I'll send you your Medal, and even throw in a free handydandy neckhanger thingie, "just like the Olympic athletes get." I'm thinking we should award some MMBMNTs retroactively, seeing as the prize was only just established this year and the forum goes back a few years. Nominations for 2006? Bearnol, perhaps? 
20070717, 10:18  #5 
Feb 2006
51_{10} Posts 
Quick and dirty
Lest just make a quick and dirty survey.
This code Code:
def f(n): a = 1 for i in range (2,n+1): a = a*i return a for i in range (2,3000): if (f(i1)+1)%i == 0: print i and this code (can I make the sieve more dirty than this Code:
for n in range(2, 3000): for x in range(2, n): if n % x == 0: break else: print n Yep, new kid on the block, beaten by 2000+ old algorithm. Eivind 
20070717, 17:55  #6 
"Michael"
Aug 2006
Usually at home
2^{2}·3·7 Posts 

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