1 837 967 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
696438876553682456053961	24	79.2	2019-12-02 11:54:37

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	134 / 640

Estimated T-Level: 26.0 ⓘ

TF below 2^82 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Lance Optican	71241AFC06C1AADB	0
Verified (Factored)	1998-12-21	Kent Lee	71241AFC06C1AADB	1568044
Verified (Factored)	2015-07-01	MadPoo	71241AFC06C1AADB	1687927

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-12-03	francijezek	DC00A9299987356D	1	377006	5	3
Verified	2019-12-12	mnd9	DC00A9299987356D	1	1542384	5	3

History

Date	User	Type	Result
2019-12-12	mnd9	C-PRP	M1837967/696438876553682456053961 : DC00A9299987356D PRP: Verified PRP without proof (not generated)
2019-12-03	francijezek	C-PRP	M1837967/696438876553682456053961 : DC00A9299987356D PRP: Verified PRP without proof (not generated)
2019-12-02	mnd9	F-ECM	Factor: 696438876553682456053961 / (ECM curve 2, B1=50000, B2=5000000, Sigma=8521646142184873)
2019-06-17	TJAOI	NF	no factor from 2^67 to 2^68
2018-08-13	Joss	NF-PM1	B1=1837967, B2=183796700, E=12
2018-01-15	TJAOI	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-09-05	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-03	mikr	NF-PM1	B1=2780000, B2=91760000, E=12
2015-07-01	MadPoo	C-LL	71241AFC06C1AADB
2015-04-27	snme2pm1	NF	no factor from 2^64 to 2^65
2015-04-27	snme2pm1	NF	no factor from 2^63 to 2^64
2014-09-22	Joss	NF-PM1	B1=169842
2014-05-19	Joss	NF-PM1	B1=134921
2011-02-07	Carsten Kossendey	NF-PM1	B1=100000, B2=1675000, E=6
2011-01-21	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-17	Architects Cubed	NF	no factor from 2^60 to 2^61