12 491 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
26006263	8	24.6	old
176240015761	12	37.4	2008-08-26 19:58:37
2498294556871	13	41.2	2008-08-26 19:58:37

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1330 / 9201

Estimated T-Level: 40.7 ⓘ

TF below 2^130 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-21	Oliver Kruse	B95671F4D9BD69C9	3	0	1	3
Verified	2017-10-12	kkmrkkblmbrbk	B95671F4D9BD69C9	3	6104	1	3
Unverified	2020-04-17	Oliver Kruse	891FFF22BD5BF0__	3	11460	5	3

History

Date	User	Type	Result
2022-09-11	BloodIce	NF-PM1	B1=100000000000, B2=65542071839964720
2022-08-29	BloodIce	NF-PM1	B1=10000000000, B2=4099880487682980
2022-08-28	BloodIce	NF-PM1	B1=1000000000, B2=333483097867920
2022-08-28	BloodIce	NF-PM1	B1=100000000, B2=28207674615120
2020-04-17	Oliver Kruse	C-PRP	M12491/26006263/176240015761/2498294556871 : 891FFF22BD5BF0__ PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M12491/26006263/176240015761/2498294556871 : B95671F4D9BD69C9 PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M12491/26006263/176240015761/2498294556871 : B95671F4D9BD69C9 PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M12491/26006263/176240015761/2498294556871 : B95671F4D9BD69C9 PRP without proof (not generated)
2016-09-09	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=10000000000, E=12
2008-08-26	-Anonymous-	F	Factor: 2498294556871
2008-08-26	-Anonymous-	F	Factor: 176240015761