5 131 253 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
128279502089779147258352657	27	86.7	2022-06-26 17:49:02

ECM

Digits	B1	Curves
25	50000	8 / 280

Estimated T-Level: 20.1 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		Ken Kriesel	D14305F50AB7A161	0
Verified (Factored)	2001-01-14	Marc Getty / Phil Fizur	D14305F50AB7A161	2948276

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2022-07-02	Poao	E9EC6060AD10D26E	1	2827902	5	3

P-1 factors

Date	Factor	B1	B2
2022-06-26	128279502089779147258352657	4000000	10316185110

History

Date	User	Type	Result
2022-07-03	Cosmos95	CERT	PRP Certification Proof certified good
2022-07-02	Poao	C-PRP	M5131253/128279502089779147258352657 : E9EC6060AD10D26E PRP proof power = 7 PRP: Verified Proof certified good
2022-06-26	Sid & Andy	F-PM1	Factor: 128279502089779147258352657 / (P-1, B1=4000000, B2=10316185110)
2022-01-15	mikr	NF	no factor from 2^70 to 2^71
2021-11-03	TJAOI	NF	no factor from 2^69 to 2^70
2020-11-09	TJAOI	NF	no factor from 2^68 to 2^69
2019-04-01	USAFSS	NF-PM1	B1=305000, B2=9607500, E=12
2018-06-20	ramgeis	NF	no factor from 2^67 to 2^68
2016-05-23	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^61
2015-08-07	snme2pm1	NF	no factor from 2^65 to 2^66
2014-12-15	VictordeHollander	NF	no factor from 2^64 to 2^65
2014-12-15	VictordeHollander	NF	no factor from 2^63 to 2^64
2009-10-07	S485122	NF	no factor from 2^62 to 2^63
2009-09-13	USAFSS	NF-PM1	B1=60000, B2=1065000, E=6
2008-12-28	Sturle Sunde	NF	no factor from 2^61 to 2^62