Prime Curios!: 19937

19937
(another Prime Pages' Curiosity)

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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.

Submitted: 2000-12-16 14:10:55; Last Modified: 2009-01-29 07:20:48.