2 238 661 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
252622839708850041307153	24	77.7	2020-04-07 12:22:06

ECM

Digits	B1	Curves
25	50000	59 / 280

Estimated T-Level: 21.1 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		The Vanguard (Nelson Jones & Mohammad Malik & Anthony Joseph & Art Mandelin & Ed	3094691FF4F2B548	0
Verified (Factored)	1999-08-16	Brian J. Beesley	3094691FF4F2B548	599356
Verified (Factored)	2018-04-21	kkmrkkblmbrbk	3094691FF4F2B548	881996

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-04-08	xyuzyz	CBEB11A3E026B4C8	1	405346	5	3
Verified	2020-04-08	oodaira	CBEB11A3E026B4C8	1	1473049	5	3

History

Date	User	Type	Result
2020-04-08	oodaira	C-PRP	M2238661/252622839708850041307153 : CBEB11A3E026B4C8 PRP: Verified PRP without proof (not generated)
2020-04-08	xyuzyz	C-PRP	M2238661/252622839708850041307153 : CBEB11A3E026B4C8 PRP: Verified PRP without proof (not generated)
2020-04-07	daveward2005	F-ECM	Factor: 252622839708850041307153 / (ECM curve 2, B1=50000, B2=5000000)
2019-04-08	TJAOI	NF	no factor from 2^67 to 2^68
2018-04-21	kkmrkkblmbrbk	C-LL	3094691FF4F2B548
2016-12-29	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2016-01-10	Alexander Dubrovin	NF-PM1	B1=2000000, B2=65000000, E=12
2015-12-02	Alexander Dubrovin	NF-PM1	B1=1000000, B2=6000000, E=6
2015-10-25	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-10	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-10	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-09-30	Joss	NF-PM1	B1=142342
2014-06-01	Joss	NF-PM1	B1=113671
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-04-27	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-14	Oscar Östlin	NF-PM1	B1=85000, B2=1636250, E=6
2010-11-08	Oscar Östlin	NF-PM1	B1=75011
2009-01-11	Sturle Sunde	NF	no factor from 2^60 to 2^61