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

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MnDetails
661
Composite, with 4 known prime factors. Cofactor is PRP (Probable-Prime).
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
13302704331030.3old
33701594891685191651.6old
10091578480823612250656172579.7old
11842028726706684482020892643372387136116.5old
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
No proof (small exponent)
2024-09-06George WoltmanPRP_PRP_PRP_PRP_4013
History
DateUserTypeResult
2024-09-06George WoltmanP-PRPM661/1330270433/3370159489168519/1009157848082361225065617/118420287267066844820208926433723871
PRP Cofactor