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

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MnStatusDetails
6998561Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
3513563422846951288972168.32020-04-03 12:20:53
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)George WoltmanF8B9019B314BFB466445743
Verified (Factored)2001-11-03Marc Getty / Phil FizurF8B9019B314BFB463812975
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-04-05Oliver Kruse285A77896C9AEF9C1549371453
Verified2020-04-07marssystems285A77896C9AEF9C1323846453
History
DateUserTypeResult
2025-01-14Stef42NF-PM1
B1=2296000, B2=7832699490
2020-04-07marssystemsC-PRP
M6998561/351356342284695128897 : 285A77896C9AEF9C
PRP: Verified
PRP without proof (not generated)
2020-04-05Oliver KruseC-PRP
M6998561/351356342284695128897 : 285A77896C9AEF9C
PRP: Verified
PRP without proof (not generated)
2020-04-03TJAOIF
Factor: 351356342284695128897 / TF: 68-69
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
2014-08-17NesowaNF-PM1
B1=435000, B2=11418750, E=12
2014-02-14lycornNF
no factor from 2^64 to 2^65
2014-02-09NesowaNF
no factor from 2^63 to 2^64