26 539 787 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite: 1 known prime factor

Trial Factored to 2⁶⁸

TF target 2⁷⁰

Factored

Factor	Digits	Bits	Date
207880931687050910129	21	67.5	2016-12-08 19:29:51

Status	Date	User	Residue	Shift	Software
Factored	2005-10-04	Lawrence C. Gray	23F212E31131D9C4	18754102	Windows,Prime95,v24 final,(aka Wc1)
Factored	2011-02-24	Reed_Young	23F212E31131D9C4	22898437	Linux 64-bit,Prime95,v25.9,build 4

History

Date	User	Type	Result
2016-12-08	NR	F	Factor: 207880931687050910129 / TF: 67-68*
2011-02-24	Reed_Young	C-LL	23F212E31131D9C4
2005-10-04	-anonymous-	C-LL	23F212E31131D9C4
2005-09-22	-anonymous-	NF-PM1	B1=310000, B2=6510000
2004-10-10	Daniel Skoog	NF	no factor TF: 1-67
2004-08-20	Daniel Skoog	NF	no factor TF: 1-67