7 122 761 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁶⁹

TF target 2⁶⁷

Factored

Factor	Digits	Bits	Date
329831135616209105447	21	68.2	2020-04-17 08:26:35

ECM

Digits	B1	Curves
25	50000	6 / 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	Software
Factored	2000-01-19	James Stuhlmacher	9488D37EFCEF1766	6976920	Windows,Prime95,v19,(aka WV1)
Factored	2002-03-31	Eric Liga	9488D37EFCEF1766	6449257	Windows,Prime95,v21,(aka WX1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2020-04-20	riccardo uberti	BF9578D4B4C78834	1	2078403	5	3
Verified	PRP without proof (not generated)	2020-04-20	Igvan28	BF9578D4B4C78834	1	5777027	5	3

History

Date	User	Type	Result
2020-04-20	Igvan28	C-PRP	M7122761/329831135616209105447 : BF9578D4B4C78834
2020-04-20	riccardo uberti	C-PRP	M7122761/329831135616209105447 : BF9578D4B4C78834
2020-04-17	TJAOI	F	Factor: 329831135616209105447 / TF: 68-69
2018-07-23	ramgeis	NF	no factor TF: 67-68
2018-06-17	Squeeky_Squirrel	NF-PM1	B1=415000, B2=12657500, E=12
2016-10-22	Gordon Spence	NF	no factor TF: 66-67
2015-06-21	VictordeHollander	NF	no factor TF: 65-66
2014-02-08	lycorn	NF	no factor TF: 64-65
2014-02-02	Nesowa	NF	no factor TF: 63-64
2011-03-13	kurly	NF-PM1	B1=85000, B2=1530000, E=6
2002-03-31	-anonymous-	C-LL	9488D37EFCEF1766
2001-11-10	-anonymous-	NF-PM1	B1=35000, B2=35000
2000-01-19	-anonymous-	C-LL	9488D37EFCEF1766
1999-11-04	-anonymous-	NF	no factor TF: 1-63
1998-07-11	-anonymous-	NF	no factor TF: 1-62
1998-07-11	-anonymous-	NF	no factor TF: 1-61