4 121 699 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
20048601199908464958280217	26	84.1	2021-08-25 00:40:55

ECM

Digits	B1	Curves
25	50000	56 / 280

Estimated T-Level: 21.0 ⓘ

TF below 2^65 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Charlie Dorian	581666230612DB15	0
Verified (Factored)	1999-12-15	Craig Etter	581666230612DB15	102389

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-08-25	ATH	C069CFC5281E5E00	1	249341	5	3

History

Date	User	Type	Result
2021-08-25	curtisc	CERT	PRP Certification Proof certified good
2021-08-25	ATH	C-PRP	M4121699/20048601199908464958280217 : C069CFC5281E5E00 PRP proof power = 7 PRP: Verified Proof certified good
2021-08-25	ATH	F-PP1	Start=2/7, B1=2500000, B2=172500000, Factor: 20048601199908464958280217
2021-06-28	axn	NF-PM1	B1=13000000, B2=650000000
2021-06-01	axn	NF	no factor from 2^69 to 2^70
2021-06-01	axn	NF	no factor from 2^68 to 2^69
2020-11-25	Carlos Pinho	NF-PM1	B1=152000, B2=3971000, E=6
2018-11-19	Yxinity	NF	no factor from 2^67 to 2^68
2017-12-12	Yxinity	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-06-01	snme2pm1	NF	no factor from 2^65 to 2^66
2013-10-28	David Campeau	NF	no factor from 2^64 to 2^65
2013-09-10	Jayder	NF	no factor from 2^63 to 2^64
2013-06-24	Squeeky_Squirrel	NF-PM1	B1=125000, B2=2343750, E=6
2011-08-04	USAFSS	NF-PM1	B1=40000, B2=580000
2011-07-01	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-12-04	Grant McCracken	NF	no factor from 2^61 to 2^62
2009-08-10	Carsten Kossendey	NF-PM1	B1=25000, B2=325000