Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
207239147Composite: 1 known prime factor
Factored
FactorDigitsBitsDate
1218553707949922724892166.72015-10-19 18:31:16
History
DateUserTypeResult
2015-10-19ConductorF
Factor: 121855370794992272489 / TF: 66-67
2013-08-06RichardNF
no factor from 2^65 to 2^66
2011-05-10sasaki3NF
no factor from 2^64 to 2^65