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natural numbers, integers, rational, surd, irrational, real, imaginary, complex, transcendental, surreal, prime, secant numbers and 53 more...
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uselessness I was just learning about this a couple days ago, particularly in reference to the Mersenne Twister. I still don't understand it, but I think it's cool (in the dorkiest possible way, of course). Nov 21, 2007
seanahan see gimps Nov 20, 2007
sionnach A Mersenne number is a number which is one less than a power of 2. A Mersenne prime is a Mersenne number which is also a prime. The first three Mersenne primes are 3, 7, and 31.
For a Mersenne number to be a candidate prime, the relevant power of 2 must be a prime itself. This condition is necessary, but not sufficient, as 2^^11 - 1 = 2047 = 23 x 89. Nov 19, 2007