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
2221Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
85424226320356311549822344892892.8old
10941848214579036483504580246126340698090462345146.32012-05-20 10:37:02
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
6026000000060928 / 105362
Estimated T-Level: 57.9
TF below 2^187 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse799AABF989313CE02013
Verified2017-10-02kkmrkkblmbrbk799AABF989313CE02013
Verified2017-12-07ATH799AABF989313CE02138113
Verified2020-04-17Oliver KruseD52DA14E559C65F42122053
Verified2024-01-27Wentao HuangD52DA14E559C65F42125753
History
DateUserTypeResult
2024-04-30masserNF-PM1
B1=100000000000, B2=179032501507109250
2024-01-27Wentao HuangC-PRP
M2221/8542422632035631154982234489/109418482145790364835045802461263406980904623 : D52DA14E559C65F4
PRP: Verified
PRP without proof (small exponent)
2020-04-17Oliver KruseC-PRP
M2221/8542422632035631154982234489/109418482145790364835045802461263406980904623 : D52DA14E559C65F4
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M2221/8542422632035631154982234489/109418482145790364835045802461263406980904623 : 799AABF989313CE0
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M2221/8542422632035631154982234489/109418482145790364835045802461263406980904623 : 799AABF989313CE0
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M2221/known_factors : 799AABF989313CE0
PRP without proof (not generated)
2016-09-08kkmrkkblmbrbkNF-PM1
B1=500000000, B2=50000000000, E=12
2012-05-20Michael KennF-ECM
Factor: 109418482145790364835045802461263406980904623