155 081 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
41871871	8	25.3	old
40098673847	11	35.2	2008-07-27 10:49:08
37655692991653431149283637556703249031	38	124.8	2016-12-02 22:20:49

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	177 / 1566

Estimated T-Level: 30.6 ⓘ

TF below 2^97 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-22	Oliver Kruse	5B2251432B6068E4	3	0	1	3
Verified	2017-10-11	kkmrkkblmbrbk	5B2251432B6068E4	3	87456	1	3
Verified	2020-04-17	Oliver Kruse	CA43C2913E82A5EA	3	131910	5	3
Verified	2024-02-03	Wentao Huang	CA43C2913E82A5EA	3	117422	5	3

P-1 factors

Date	Factor	B1	B2
2016-12-02	37655692991653431149283637556703249031	100000000	2000000000

History

Date	User	Type	Result
2024-02-03	Naegi Makoto	CERT	PRP Certification Proof certified good
2024-02-03	Wentao Huang	C-PRP	M155081/41871871/40098673847/37655692991653431149283637556703249031 : CA43C2913E82A5EA PRP proof power = 5 PRP: Verified Proof certified good
2020-04-17	Oliver Kruse	C-PRP	M155081/41871871/40098673847/37655692991653431149283637556703249031 : CA43C2913E82A5EA PRP: Verified PRP without proof (small exponent)
2017-10-11	kkmrkkblmbrbk	C-PRP	M155081/41871871/40098673847/37655692991653431149283637556703249031 : 5B2251432B6068E4 PRP: Verified PRP without proof (small exponent)
2017-09-21	Oliver Kruse	C-PRP	M155081/known_factors : 5B2251432B6068E4 PRP without proof (not generated)
2016-12-02	kkmrkkblmbrbk	F-PM1	Factor: 37655692991653431149283637556703249031 / (P-1, B1=100000000, B2=2000000000, E=12)
2008-07-27	J Feitsma	F	Factor: 40098673847