1 918 771 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 3 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
34408372470127	14	45.0	old
2996346340107501502559	22	71.3	2022-02-10 10:46:55
194448725829553705928777	24	77.4	2022-02-10 10:46:55

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	3AF741BEA821DC50	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-04	Oliver Kruse	2E555CB4F9C0F0E4	1	0	1	3
Verified (Factored)	2017-11-09	kkmrkkblmbrbk	2E555CB4F9C0F0E4	1	821610	1	3
Verified	2022-02-16	Poao	3AF741BEA821DC50	3	485549	5	3

History

Date	User	Type	Result
2025-09-03	wza	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	3AF741BEA821DC50 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2022-02-16	Ember_Edison	CERT	PRP Certification Proof certified good
2022-02-16	Poao	C-PRP	M1918771/34408372470127/2996346340107501502559/194448725829553705928777 : 3AF741BEA821DC50 PRP proof power = 7 PRP: Verified Proof certified good
2022-02-10	TJAOI	F-ECM	Factor: 194448725829553705928777 / (ECM curve 45, B1=50000, B2=6600000)
2022-02-10	TJAOI	F-ECM	Factor: 2996346340107501502559 / (ECM curve 83, B1=50000, B2=6600000)
2017-11-09	kkmrkkblmbrbk	C-PRP	M1918771/34408372470127 : 2E555CB4F9C0F0E4 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1918771/34408372470127 : 2E555CB4F9C0F0E4 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12