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primenumbers · Prime numbers and primality testing
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Group Information

  • Members: 1193
  • Category: Number Theory
  • Founded: Dec 27, 2000
  • Language: English
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Name Creator
A Math Forum
Various math forums, Hundreds of solved problems, Problem of the Week, Journal ...
http://www.mymathforum.com 		julien_santini
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Cool Numbers
The site analyzes 8-digit numbers for certain patterns including primes. The site will soon handle numbers of fewer and more digits. It is also developing a Cool Numbers index to give an absolute scale for patterns. Inquiries and suggestions are welcome through the site or to feedback@coolnumbers.com. I am currently looking for algorithms to search for specific patterns, whether prime-related or otherwise.
http://www.coolnumbers.com 		coolnumbers314
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Factorization of numbers near googolplex
Known prime factors of numbers in the range 10^(10^100) - 999 to 10^(10^100) + 999, including more than 57000 prime factors of googolplex + 10 and more than 34000 prime factors of googolplex - 10.
http://www.alpertron.com.ar/GOOGOL.HTM 		alpertron
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Mersenne factorizations
Mersenne number information, including known factors and progress
http://www.garlic.com/~wedgingt/mersenne.html 		wedgingt
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Nick's Mathematical Puzzles
A variety of puzzles, with hints, answers, fully worked solutions, and links to related mathematical topics. New puzzles are added on a regular basis.
http://www.qbyte.org/puzzles/ 		nick_hobson
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The Top-20 Prime Gaps
The largest known prime gaps measured by absolute or relative size, or a combination
http://users.cybercity.dk/~dsl522332/math/primegaps/gaps20.htm 		jkand71
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XYYXF project
Factorisations of x^y+y^x
http://xyyxf.at.tut.by/default.html#0 		thefatphil
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