19937

+ 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 number 19937 is also a circular prime.

+ The commonly used variant of Mersenne Twister, MT19937, is a pseudorandom number generator designed to have a period of 2^19937-1.

(There is one curio for this number that has not yet been approved by an editor.)

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