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The 25th and 26th Mersenne primes

Authors: Curt Noll and Laura Nickel
Journal: Math. Comp. 35 (1980), 1387-1390
MSC: Primary 10A25
MathSciNet review: 583517
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Abstract: The 25th and 26th Mersenne primes are ${2^{21701}} - 1$ and ${2^{23209}} - 1$, respectively. Their primality was determined with an implementation of the Lucas-Lehmer test on a CDC Cyber 174 computer. The 25th and 26th even perfect numbers are $({2^{21701}} - 1)\;{2^{21700}}$ and $({2^{23209}} - 1)\;{2^{23208}}$, respectively.

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Article copyright: © Copyright 1980 American Mathematical Society