238 877 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
595862833345431191795927570929	30	98.9	2019-04-08 06:58:43

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	476 / 640

Estimated T-Level: 28.7 ⓘ

TF below 2^90 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	3362	0
Verified (Factored)		Unknown	3362	0
Verified (Factored)		Brian J. Beesley	4C82A6784025B362	0
Verified (Factored)		Eivind Triel	4C82A6784025B362	5788
Verified (Factored)	2001-09-16	Brian J. Beesley	4C82A6784025B362	139143

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-04-09	matzetoni	054A3C46B741677D	1	101458	5	3
Verified	2019-04-16	marcomich	054A3C46B741677D	1	231161	5	3

P-1 factors

Date	Factor	B1	B2
2019-04-08	595862833345431191795927570929	100000000	2000000000

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-04-16	marcomich	C-PRP	M238877/595862833345431191795927570929 : 054A3C46B741677D PRP: Verified PRP without proof (small exponent)
2019-04-09	matzetoni	C-PRP	M238877/595862833345431191795927570929 : 054A3C46B741677D PRP: Verified PRP without proof (small exponent)
2019-04-08	alex	F-PM1	Factor: 595862833345431191795927570929 / (P-1, B1=100000000, B2=2000000000, E=12)
2018-03-09	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-05-13	Numberwang	NF-PM1	B1=2671, B2=66775
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-01-13	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-13	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-07-26	snme2pm1	NF	no factor from 2^61 to 2^62
2014-12-17	Denial140	NF-PM1	B1=10000000, B2=250000000, E=12
2013-10-12	David Campeau	NF-PM1	B1=2685000, B2=77865000, E=12
2013-07-22	lycorn	NF	no factor from 2^60 to 2^61
2012-02-26	Joss	NF-PM1	B1=2658270
2011-07-24	Joss	NF-PM1	B1=2126616
2011-02-01	Joss	NF-PM1	B1=2000000
2009-01-24	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59