433 261 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
28552987087503777616932814687	29	94.5	2019-05-16 14:11:42

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	364 / 640

Estimated T-Level: 27.8 ⓘ

TF below 2^87 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	12F0	0
Verified (Factored)		Wolfgang Schildbach	22EC2647A1D052F0	0
Verified (Factored)		Eivind Triel	22EC2647A1D052F0	424462
Verified (Factored)	2002-03-10	Dennis Pope	22EC2647A1D052F0	316501

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-05-17	Niels_Mache_Nextcloud	6D9920F86CC993A8	1	353468	5	3
Verified	2019-05-17	francijezek	6D9920F86CC993A8	1	81755	5	3
Verified	2019-05-20	Chang Chia-Tche	6D9920F86CC993A8	1	19960	5	3

History

Date	User	Type	Result
2019-05-20	Chang Chia-Tche	C-PRP	M433261/28552987087503777616932814687 : 6D9920F86CC993A8 PRP: Verified PRP without proof (small exponent)
2019-05-17	francijezek	C-PRP	M433261/28552987087503777616932814687 : 6D9920F86CC993A8 PRP: Verified PRP without proof (small exponent)
2019-05-17	Niels_Mache_Nextcloud	C-PRP	M433261/28552987087503777616932814687 : 6D9920F86CC993A8 PRP: Verified PRP without proof (small exponent)
2019-05-16	alex	F-ECM	Factor: 28552987087503777616932814687 / (ECM curve 251, B1=250000, B2=25000000, Sigma=8517317495950318)
2018-12-12	Gordon Spence	NF	no factor from 2^65 to 2^66
2017-12-21	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-11-28	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-28	Gordon Spence	NF	no factor from 2^62 to 2^63
2012-12-01	dbaugh	NF	no factor from 2^61 to 2^62
2012-11-27	dbaugh	NF	no factor from 2^60 to 2^61
2012-09-04	markr	NF-PM1	B1=10000000, B2=400000000, E=12
2010-08-16	Rob_Dee	NF-PM1	B1=1000000, B2=2000000, E=6
2010-08-15	Rob_Dee	NF-PM1	B1=500000, B2=1000000
2009-08-26	Carsten Kossendey	NF-PM1	B1=433261