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:





MnDetails
287873
Composite, with 2 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
144031819857167031753.7old
1674608718627580475845711038713097.12021-04-22 06:48:35
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000192 / 1566
Estimated T-Level: 30.6 ⓘ
TF below 2^97 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
No proof (small exponent)
2017-09-22Oliver KruseE41FCB025B0307DE1013
Factored
No proof (small exponent)
2017-10-12Oliver KruseE41FCB025B0307DE117886013
Factored
No proof (small exponent)
2017-11-06kkmrkkblmbrbkE41FCB025B0307DE13367313
Factored
No proof (small exponent)
2020-04-17Oliver KruseC41AD44C2A39E4921685653
Verified
Certified Good
2021-04-22RichD0C41AD44C2A39E492214822953
History
DateUserTypeResult
2024-11-14yuriy_5-1NF-PM1B1=26484316, B2=6490139666010
2023-02-17USAFSSNF-PM1B1=4000000, B2=19304250420
2022-02-06ANONYMOUSNF-PM1B1=50000
2021-04-22Ben DeloCERT
Proof certified good
2021-04-22RichD0C-PRPM287873/14403181985716703/167460871862758047584571103871 : C41AD44C2A39E492
Proof Certified Good

Proof Power: 5

2021-04-22nordiF-PP1Factor: 167460871862758047584571103871 / Start=2/7, B1=10000000, B2=1000000000
2020-04-17Oliver KruseC-PRPM287873/14403181985716703 : C41AD44C2A39E492
2017-11-06kkmrkkblmbrbkC-PRPM287873/14403181985716703 : E41FCB025B0307DE
2017-10-12Oliver KruseC-PRPM287873/14403181985716703 : E41FCB025B0307DE
2017-09-22Oliver KruseC-PRPM287873/14403181985716703 : E41FCB025B0307DE
2017-09-22Oliver KruseC-PRPM287873/14403181985716703 : E41FCB025B0307DE
2003-08-25-anonymous-FFactor: 14403181985716703
2000-05-05-anonymous-FFactor: 14403181985716703
1999-11-24-anonymous-NFno factor TF: 52-53