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

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Exponent Range:










MnStatusDetails
6993559Factored
FactorDigitsBitsDate
976906421787953361733804732686.32023-09-25 19:31:42
ECM
DigitsB1Curves
25500006 / 280
Estimated T-Level: 20.1 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1999-10-15Bob MetakesC14943223C972EE65120363
Verified (Factored)2002-01-02Rafa³ StajkowskiC14943223C972EE62314080
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2023-09-26Naegi Makoto452D56A384975D531216375753
P-1 factors
DateFactorB1B2
2023-09-259769064217879533617338047335000009616446840
History
DateUserTypeResult
2023-09-26curtiscCERT
PRP Certification
Proof certified good
2023-09-26Naegi MakotoC-PRP
M6993559/97690642178795336173380473 : 452D56A384975D53
PRP proof power = 8
PRP: Verified
Proof certified good
2023-09-25ThaF-PM1
Factor: 97690642178795336173380473 / (P-1, B1=3500000, B2=9616446840)
2023-07-19takahashiNF-PM1
B1=2500000, B2=50176980
2021-09-25SRBaseNF
no factor from 2^71 to 2^72
2020-09-16takahashiNF
no factor from 2^70 to 2^71
2020-07-26takahashiNF
no factor from 2^69 to 2^70
2020-04-03TJAOINF
no factor from 2^68 to 2^69
2020-02-04takahashiNF-PM1
B1=600000, B2=12000000, E=12
2018-02-27-Anonymous-NF
no factor from 2^67 to 2^68
2016-04-27Gordon SpenceNF
no factor from 2^66 to 2^67
2015-07-03VictordeHollanderNF
no factor from 2^65 to 2^66
2014-02-14lycornNF
no factor from 2^64 to 2^65
2014-02-09NesowaNF
no factor from 2^63 to 2^64
2011-12-03James HeinrichNF-PM1
B1=135000, B2=2835000, E=6