221 537 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
476304551	9	28.8	old
129998937786742101038653183103	30	96.7	2020-01-06 12:19:00

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	169 / 1566

Estimated T-Level: 30.5 ⓘ

TF below 2^96 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-09-22	Oliver Kruse	FCF592E02FD7F615	1	0	1	3
Verified (Factored)	2017-10-12	kkmrkkblmbrbk	FCF592E02FD7F615	1	183769	1	3
Verified	2020-01-07	mnd9	BDB26F4A28EF427A	2	137580	5	3
Verified	2020-01-09	Luigi Morelli	BDB26F4A28EF427A	2	51615	5	3

History

Date	User	Type	Result
2022-03-08	Oliver Kruse	NF-PM1	B1=30000000, B2=10070832992220
2021-06-18	Oliver Kruse	NF-PM1	B1=30000000, B2=3000000000
2020-01-09	Luigi Morelli	C-PRP	M221537/476304551/129998937786742101038653183103 : BDB26F4A28EF427A PRP: Verified PRP without proof (small exponent)
2020-01-07	mnd9	C-PRP	M221537/476304551/129998937786742101038653183103 : BDB26F4A28EF427A PRP: Verified PRP without proof (small exponent)
2020-01-06	TJAOI	F-ECM	Factor: 129998937786742101038653183103 / (ECM curve 24, B1=250000, B2=25000000)
2017-10-12	kkmrkkblmbrbk	C-PRP	M221537/476304551 : FCF592E02FD7F615 PRP: Verified PRP without proof (small exponent)
2017-09-22	Oliver Kruse	C-PRP	M221537/476304551 : FCF592E02FD7F615 PRP: Verified PRP without proof (not generated)
2017-09-22	Oliver Kruse	C-PRP	M221537/476304551 : FCF592E02FD7F615 PRP without proof (not generated)