3 948 311 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
155860632797968573577	21	67.1	2018-06-25 06:37:56

ECM

Digits	B1	Curves
25	50000	12 / 280

Estimated T-Level: 20.2 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1998-02-08	Eric Dennison	FA2D486729A46F50	0
Verified (Factored)	2000-02-01	Joshua Sharp	FA2D486729A46F50	1348763

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2018-06-25	_p95holder_	441D0CADEF69D100	1	339295	5	3
Verified	2018-06-26	arnaud	441D0CADEF69D100	1	49109	5	3

History

Date	User	Type	Result
2022-05-12	Joss	NF-PM1	B1=500000, B2=113097600
2018-06-26	arnaud	C-PRP	M3948311/155860632797968573577 : 441D0CADEF69D100 PRP: Verified PRP without proof (not generated)
2018-06-25	_p95holder_	C-PRP	M3948311/155860632797968573577 : 441D0CADEF69D100 PRP: Verified PRP without proof (not generated)
2018-06-25	TJAOI	F	Factor: 155860632797968573577 / TF: 67-68
2017-07-20	Joss	NF-PM1	B1=380160, B2=3801600, E=6
2016-12-11	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-05-02	Joss	NF-PM1	B1=190080, B2=3421440
2016-05-01	Joss	NF-PM1	B1=190080, B2=2866064, E=6
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2016-02-13	ramgeis	NF	no factor from 2^65 to 2^66
2015-01-14	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-01-14	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-11-17	Joss	NF-PM1	B1=86256
2012-02-20	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-09-24	Squeeky_Squirrel	NF-PM1	B1=70000, B2=1190000, E=6
2011-03-22	Grant McCracken	NF	no factor from 2^61 to 2^62
2009-08-02	Carsten Kossendey	NF-PM1	B1=20000, B2=285000
2009-01-01	Architects Cubed	NF	no factor from 2^60 to 2^61