Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
7561Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
589759619.2old
101135693443131443.2old
9055114260239591549.7old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000002050 / 9201
Estimated T-Level: 41.1
TF below 2^132 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse006114DBF28B92D13013
Verified2017-10-12kkmrkkblmbrbk006114DBF28B92D1323113
Verified2020-04-17Oliver Kruse34402FEE8C7A3F733726553
Verified2024-02-03Wentao Huang34402FEE8C7A3F73337253
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M7561/589759/10113569344313/905511426023959 : 34402FEE8C7A3F73
PRP: Verified
PRP without proof (small exponent)
2021-07-07ViliamFNF-PM1
B1=1000000000, B2=201000000000
2020-04-17Oliver KruseC-PRP
M7561/589759/10113569344313/905511426023959 : 34402FEE8C7A3F73
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M7561/589759/10113569344313/905511426023959 : 006114DBF28B92D1
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M7561/589759/10113569344313/905511426023959 : 006114DBF28B92D1
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M7561/589759/10113569344313/905511426023959 : 006114DBF28B92D1
PRP without proof (not generated)