1 986 631 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
40129946201	11	35.2	old
662265609459085362791	21	69.2	2021-04-27 01:13:23

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	58 / 640

Estimated T-Level: 25.5 ⓘ

TF below 2^80 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-05	Oliver Kruse	28EB2233FF8EBC01	1	0	1	3
Verified (Factored)	2017-11-12	kkmrkkblmbrbk	28EB2233FF8EBC01	1	1727202	1	3
Verified	2021-04-27	mrh	6D7B64817FB638DE	2	1645317	5	3

History

Date	User	Type	Result
2022-08-14	USAFSS	NF-PM1	B1=132000, B2=134381520
2021-04-27	Ben Delo	CERT	PRP Certification Proof certified good
2021-04-27	mrh	C-PRP	M1986631/40129946201/662265609459085362791 : 6D7B64817FB638DE PRP proof power = 7 PRP: Verified Proof certified good
2021-04-27	nordi	F-ECM	Factor: 662265609459085362791 / (ECM curve 2, B1=50000, B2=6750000, Sigma=5607759689287547)
2017-11-12	kkmrkkblmbrbk	C-PRP	M1986631/40129946201 : 28EB2233FF8EBC01 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1986631/40129946201 : 28EB2233FF8EBC01 PRP: Verified (Factored) PRP without proof (not generated)