Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
4187251Composite, with 1 known prime factor. Cofactor is PRP (Probable-Prime).
Factored
FactorDigitsBitsDate
722343423715191446.0old
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-31ATHPRP_PRP_PRP_PRP_1165652913
Verified2017-11-09kkmrkkblmbrbkPRP_PRP_PRP_PRP_1162147713
History
DateUserTypeResult
2024-09-02cramsey87NF-PM1
B1=400000, B2=8396237850
2017-11-09kkmrkkblmbrbkP-PRP
M4187251/72234342371519 is a probable prime.
2017-10-31ATHP-PRP
M4187251/72234342371519 is a probable prime.