1 154 221 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
1837195784165694751	19	60.7	2007-10-09 15:35:06
550292418199991571761	21	68.9	2017-06-30 19:48:30
47417234609458216053281	23	75.3	2014-12-28 12:45:15

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	100 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	312A	0
Verified (Factored)		The Grebelius Family	C13D96F779F0B12A	0
Verified (Factored)	2002-07-14	S57483	C13D96F779F0B12A	1108075

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	E4B3F4E9AA23BBF7	3	0	1	3
Verified	2017-10-17	Oliver Kruse	E4B3F4E9AA23BBF7	3	905395	1	3

P-1 factors

Date	Factor	B1	B2
2014-12-28	47417234609458216053281	300000	10000000

History

Date	User	Type	Result
2022-04-12	LordJulius	NF	no factor from 2^63 to 2^64
2022-04-12	LordJulius	NF	no factor from 2^62 to 2^63
2022-04-12	LordJulius	NF	no factor from 2^61 to 2^62
2017-10-17	Oliver Kruse	C-PRP	M1154221/1837195784165694751/47417234609458216053281/550292418199991571761 : E4B3F4E9AA23BBF7 PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M1154221/1837195784165694751/47417234609458216053281/550292418199991571761 : E4B3F4E9AA23BBF7 PRP: Verified PRP without proof (not generated)
2017-09-29	Oliver Kruse	C-PRP	M1154221/1837195784165694751/47417234609458216053281/550292418199991571761 : E4B3F4E9AA23BBF7 PRP without proof (not generated)
2017-06-30	TJAOI	F-ECM	Factor: 550292418199991571761 / (ECM curve 61, B1=50000, B2=5000000)
2014-12-28	alpertron	F-PM1	Factor: 47417234609458216053281 / (P-1, B1=300000, B2=10000000, E=12)
2007-10-09	Team_Bundu	F-ECM	Factor: 1837195784165694751