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
1971503Factored
FactorDigitsBitsDate
3943007721.9old
4977942728640771431858.82015-10-01 11:45:49
8432469345447985765432169.52021-04-09 20:25:20
ECM
DigitsB1Curves
2550000280 / 280
3025000058 / 640
Estimated T-Level: 25.5
TF below 2^80 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-09-30alpertronD76C81150DA351A82013
Verified (Factored)2017-10-20Oliver KruseD76C81150DA351A82183857413
Verified2021-04-30Kirill FrolovCF39CA3DF648271536493553
History
DateUserTypeResult
2023-12-17USAFSSNF-PM1
B1=480000, B2=460965960
2022-08-12USAFSSNF-PM1
B1=132000, B2=134381520
2021-04-30Simon JosefssonCERT
PRP Certification
Proof certified good
2021-04-30Kirill FrolovC-PRP
M1971503/3943007/497794272864077143/843246934544798576543 : CF39CA3DF6482715
PRP proof power = 7
PRP: Verified
Proof certified good
2021-04-09PoaoF-ECM
Factor: 843246934544798576543 / (ECM curve 2, B1=50000, B2=5000000, Sigma=8302966768857428)
2017-10-20Oliver KruseC-PRP
M1971503/3943007/497794272864077143 : D76C81150DA351A8
PRP: Verified (Factored)
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M1971503/3943007/497794272864077143 : D76C81150DA351A8
PRP: Verified (Factored)
PRP without proof (not generated)
2015-10-01TJAOIF
Factor: 497794272864077143 / TF: 58-59