11 221 993 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 6 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
67331959	8	26.0	old
489170714787481	15	48.8	2014-04-15 11:39:18
19171172786783447	17	54.1	2014-10-31 12:48:04
11055335199732636913	20	63.3	2017-01-13 12:24:03
19214345893422004343	20	64.1	2017-07-06 09:24:49
131922739894851146551	21	66.8	2020-10-20 10:13:30

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-06-13	kutens	3B76BB0EEB346C85	6	2817327	5	3

History

Date	User	Type	Result
2025-05-26	vsh	NF	no factor from 2^71 to 2^72
2025-04-01	vsh	NF	no factor from 2^70 to 2^71
2025-03-03	vsh	NF	no factor from 2^69 to 2^70
2024-12-31	vsh	NF-PM1	B1=10000000, B2=20000264130
2024-05-10	vsh	NF-PM1	B1=2500000, B2=1568269560
2024-05-01	vsh	NF-PM1	B1=1400000, B2=795430350
2024-04-19	vsh	NF-PM1	B1=700000, B2=352517880
2024-04-17	vsh	NF-PM1	B1=350000, B2=158180880
2023-01-10	LordJulius	NF	no factor from 2^68 to 2^69
2022-09-12	LordJulius	NF	no factor from 2^67 to 2^68
2022-09-12	LordJulius	NF	no factor from 2^65 to 2^66
2022-04-07	James Heinrich	NF	no factor from 2^65 to 2^66
2021-06-13	Cavalico	CERT	PRP Certification Proof certified good
2021-06-13	kutens	C-PRP	M11221993/67331959/489170714787481/19171172786783447/11055335199732636913/19214345893422004343/131922739894851146551 : 3B76BB0EEB346C85 PRP proof power = 8 PRP: Verified Proof certified good
2020-10-20	TJAOI	F	Factor: 131922739894851146551 / TF: 66-67
2017-07-06	TJAOI	F	Factor: 19214345893422004343 / TF: 64-65
2017-01-13	TJAOI	F	Factor: 11055335199732636913 / TF: 63-64
2014-10-31	TJAOI	F	Factor: 19171172786783447 / TF: 54-55
2014-04-15	TJAOI	F	Factor: 489170714787481