12 285 829 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
61976990340431088240338849	26	85.7	2018-04-28 07:12:04

ECM

Digits	B1	Curves
25	50000	14 / 280

Estimated T-Level: 20.3 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	2002-03-16	Jeff Mock	E295859092962E01	6668257
Verified (Factored)	2004-07-26	Gerhard H Wrodnigg	E295859092962E01	2158503

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-02-09	riccardo uberti	A1C4708973586204	1	1760298	5	3
Verified	2021-02-09	Jaytholomew	A1C4708973586204	1	2102873	5	3

P-1 factors

Date	Factor	B1	B2
2018-04-28	61976990340431088240338849	430000	8500000

History

Date	User	Type	Result
2022-02-23	riccardo uberti	NF-PM1	B1=1500000, B2=30000000
2021-02-10	arachnotron	CERT	PRP Certification Proof certified good
2021-02-09	Jaytholomew	C-PRP	M12285829/61976990340431088240338849 : A1C4708973586204 PRP proof power = 8 PRP: Verified Proof certified good
2019-02-09	riccardo uberti	C-PRP	M12285829/61976990340431088240338849 : A1C4708973586204 PRP: Verified PRP without proof (not generated)
2018-04-28	riccardo uberti	F-PM1	Factor: 61976990340431088240338849 / (P-1, B1=430000, B2=8500000, E=12)
2017-11-03	ramgeis	NF	no factor from 2^68 to 2^69
2015-07-25	Tha	NF	no factor from 2^67 to 2^68
2015-03-07	Tha	NF	no factor from 2^66 to 2^67
2013-09-29	Nesowa	NF	no factor from 2^65 to 2^66
2013-08-03	lycorn	NF	no factor from 2^64 to 2^65