392 983 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
81255381987106254347554066678297	32	106.0	2019-04-15 01:52:42

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	535 / 640

Estimated T-Level: 29.2 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		John Sweeney	F63	0
Verified (Factored)		David Slowinski	2F63	0
Verified (Factored)		Guillermo Ballester Valor	D8E7FC6D348B2F63	0
Verified (Factored)		Eivind Triel	D8E7FC6D348B2F63	223788
Verified (Factored)	2001-12-22	Dennis Pope	D8E7FC6D348B2F63	145655

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-04-15	matzetoni	70E7AE1FA1BB7AEC	1	299706	5	3
Verified	2019-04-17	-Anonymous-	70E7AE1FA1BB7AEC	1	145356	5	3

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-04-17	-Anonymous-	C-PRP	M392983/81255381987106254347554066678297 : 70E7AE1FA1BB7AEC PRP: Verified PRP without proof (small exponent)
2019-04-15	matzetoni	C-PRP	M392983/81255381987106254347554066678297 : 70E7AE1FA1BB7AEC PRP: Verified PRP without proof (small exponent)
2019-04-15	alex	F-ECM	Factor: 81255381987106254347554066678297 / (ECM curve 286, B1=250000, B2=25000000, Sigma=5830266262881287)
2018-01-17	BloodERazor	NF	no factor from 2^64 to 2^65
2017-01-19	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2015-11-19	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-19	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2012-07-15	alpertron	NF-PM1	B1=10000000, B2=200000000, E=12
2011-02-27	monst	NF	no factor from 2^60 to 2^61
2009-01-12	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-29	Sturle Sunde	NF	no factor from 2^58 to 2^59