19937
This number is a prime.
The largest known Mersenne prime exponent whose digits are all odd. Bryant Tuckerman found M(19937) using an IBM 360/91 computer in 1971.
The commonly used variant of Mersenne Twister, MT19937, is
a pseudorandom number generator designed to have a period
of 2^19937-1.
19937 is the largest known Mersenne circular prime exponent. [Harrison]
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