1 940 123 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
225935962119211995256402961	27	87.5	2020-10-30 21:53:17

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	136 / 640

Estimated T-Level: 26.1 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		Pierre Sopel	1C30786B0B7684C9	0
Verified (Factored)	1999-01-02	David M. Anderson	1C30786B0B7684C9	1208014
Verified (Factored)	2015-07-04	MadPoo	1C30786B0B7684C9	588858

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-11-01	arnaud	6B3013DC89C9FA88	1	1545779	5	3

History

Date	User	Type	Result
2020-11-01	curtisc	CERT	PRP Certification Proof certified good
2020-11-01	arnaud	C-PRP	M1940123/225935962119211995256402961 : 6B3013DC89C9FA88 PRP proof power = 7 PRP: Verified Proof certified good
2020-10-30	Keysarecool	F-ECM	Factor: 225935962119211995256402961 / (ECM curve 4, B1=50000, B2=5000000, Sigma=1982731279156463)
2019-05-11	chuenkit	NF	no factor from 2^67 to 2^68
2018-04-09	Joss	NF-PM1	B1=1940123, B2=194012300, E=12
2018-03-02	Joss	NF-PM1	B1=1940123, B2=120000000, E=12
2018-02-12	Joss	NF-PM1	B1=1940123, B2=60000000, E=12
2018-01-27	Joss	NF-PM1	B1=1940123, B2=30000000, E=12
2017-12-04	TJAOI	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
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
2015-09-05	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-04	MadPoo	C-LL	1C30786B0B7684C9
2015-05-06	lycorn	NF	no factor from 2^64 to 2^65
2015-05-06	lycorn	NF	no factor from 2^63 to 2^64
2011-11-25	kurly	NF-PM1	B1=1000000, B2=30000000, E=12
2011-08-27	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-01-29	S485122	NF	no factor from 2^60 to 2^61