1 550 231 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
3100463	7	21.6	old
24947935610506000133244121	26	84.4	2019-07-12 08:38:07

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 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	65460479CC48341B	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-01	Oliver Kruse	FA07216D623DB1EE	1	0	1	3
Verified (Factored)	2017-10-30	kkmrkkblmbrbk	FA07216D623DB1EE	1	649951	1	3
Verified	2019-07-12	Niels_Mache_Nextcloud	65460479CC48341B	2	1282100	5	3
Verified	2019-07-12	ATH	65460479CC48341B	2	1275926	5	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	65460479CC48341B PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2019-07-12	ATH	C-PRP	M1550231/3100463/24947935610506000133244121 : 65460479CC48341B PRP: Verified PRP without proof (not generated)
2019-07-12	Niels_Mache_Nextcloud	C-PRP	M1550231/3100463/24947935610506000133244121 : 65460479CC48341B PRP: Verified PRP without proof (not generated)
2019-07-12	TJAOI	F-ECM	Factor: 24947935610506000133244121 / (ECM curve 207, B1=50000, B2=5000000)
2017-10-30	kkmrkkblmbrbk	C-PRP	M1550231/3100463 : FA07216D623DB1EE PRP: Verified PRP without proof (not generated)
2017-10-01	Oliver Kruse	C-PRP	M1550231/3100463 : FA07216D623DB1EE PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12