11 954 557 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 4 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
21805111969	11	34.3	old
339198600319	12	38.3	2008-09-08 07:44:00
40071888333296881	17	55.2	2015-01-09 15:24:19
256890054286991183	18	57.8	2015-07-21 10:14:29

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-12-09	mrh	8FE39D2E64698677	4	3681444	5	3

History

Date	User	Type	Result
2023-05-20	nordi	NF-PM1	B1=400000, B2=428459850
2021-12-09	69-bit_color_depth	CERT	PRP Certification Proof certified good
2021-12-09	mrh	C-PRP	M11954557/21805111969/339198600319/40071888333296881/256890054286991183 : 8FE39D2E64698677 PRP proof power = 8 PRP: Verified Proof certified good
2021-11-23	nordi	NF-PM1	B1=400000, B2=12000000
2021-11-20	nordi	NF-PM1	B1=400000
2015-07-21	TJAOI	F	Factor: 256890054286991183 / TF: 57-58
2015-01-09	TJAOI	F	Factor: 40071888333296881 / TF: 55-56
2008-09-08	Will Edgington	F	Factor: 339198600319