345 887 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
1719576373717226518585392037489	31	100.4	2019-03-25 04:03:43

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	524 / 640

Estimated T-Level: 29.1 ⓘ

TF below 2^92 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	2CAF	0
Verified (Factored)		John Sweeney	A473FD54C325ACAF	0
Verified (Factored)		Mike Gach	A473FD54C325ACAF	0
Verified (Factored)		Eivind Triel	A473FD54C325ACAF	341115
Verified (Factored)	2016-06-01	MadPoo	A473FD54C325ACAF	60081

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-03-25	_p95holder_	165B12C29F1554EA	1	1205	5	3
Verified	2019-03-26	kkmrkkblmbrbk	165B12C29F1554EA	1	90916	5	3

History

Date	User	Type	Result
2019-03-26	kkmrkkblmbrbk	C-PRP	M345887/1719576373717226518585392037489 : 165B12C29F1554EA PRP: Verified PRP without proof (small exponent)
2019-03-25	_p95holder_	C-PRP	M345887/1719576373717226518585392037489 : 165B12C29F1554EA PRP: Verified PRP without proof (small exponent)
2019-03-25	alex	F-ECM	Factor: 1719576373717226518585392037489 / (ECM curve 348, B1=250000, B2=25000000, Sigma=4527027949274586)
2018-02-16	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-10-25	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2016-06-01	MadPoo	C-LL	A473FD54C325ACAF
2015-12-17	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-12-17	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-07-25	NR	NF	no factor from 2^61 to 2^62
2013-06-28	Sid & Andy	NF	no factor from 2^60 to 2^61
2010-05-07	Bud	NF-PM1	B1=10000000, B2=200000000, E=12
2009-01-27	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59