7 861 411 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 2⁶⁸

TF target 2⁶⁷

Factored

Factor	Digits	Bits	Date
2104810621158780826494391	25	80.8	2012-10-06 13:31:52

P-1 factors

Date	Factors	B1	B2
2012-10-06	2104810621158780826494391	100000	0

Status	Date	User	Residue	Shift	Software
Factored	1999-08-16	Alan Vidmar	A38830AEF85E0963	0	Windows,Prime95,v16,NT service,(aka WS5)
Factored	2002-06-23	chris clark	A38830AEF85E0963	6356456	Linux 32-bit,Prime95,v21,(aka WX2)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2018-05-24	storm5510	FB88ED89978975D1	1	660925	5	3
Verified	PRP without proof (not generated)	2019-10-27	marssystems	FB88ED89978975D1	1	5706955	5	3

History

Date	User	Type	Result
2025-01-01	Stef42	NF-PM1	B1=1132000, B2=1905976800
2019-10-27	marssystems	C-PRP	M7861411/2104810621158780826494391 : FB88ED89978975D1
2018-05-24	storm5510	C-PRP	M7861411/2104810621158780826494391 : FB88ED89978975D1
2012-10-06	Nesowa	F-PM1	Factor: 2104810621158780826494391
2002-07-14	-anonymous-	NF-PM1	B1=45000, B2=663750
2002-06-23	-anonymous-	C-LL	A38830AEF85E0963
2002-05-11	-anonymous-	NF-PM1	B1=45000, B2=663750
1999-08-16	vidmar	C-LL	A38830AEF85E0963
1999-01-17	-anonymous-	NF	no factor TF: 1-63