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

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Exponent Range:





MnDetails
643
Composite, with 2 known prime factors. Cofactor is PRP (Probable-Prime).
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
3189281721.6old
2253242905260567022502639105439342883316820723480243491509088130362035371233.7old
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
No proof (small exponent)
2024-09-06George WoltmanPRP_PRP_PRP_PRP_2013
History
DateUserTypeResult
2024-09-06George WoltmanP-PRPM643/3189281/22532429052605670225026391054393428833168207234802434915090881303620353
PRP Cofactor