5 453 809 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 1 known prime factor. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁶⁶

Factored

Factor	Digits	Bits	Date
126879052653023274511	21	66.8	2016-06-27 18:59:10

ECM

Digits	B1	Curves
25	50000	6 / 280

Estimated T-Level: 20.1 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored	1998-09-06	Andy Kohler	A98F0345F759168E	0	Windows,Prime95,v16,NT service,(aka WS5)
Factored	2000-08-17	John W. Wustenberg	A98F0345F759168E	4875204	Windows,Prime95,v20,(aka WW1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-12-02	storm5510	C571B284F3E50C1B	1	5054808	5	3
Verified	PRP without proof (not generated)	2018-03-11	kkmrkkblmbrbk	C571B284F3E50C1B	1	2030892	5	3

History

Date	User	Type	Result
2025-05-09	Sid & Andy	NF-PM1	B1=3600000, B2=8761592070
2018-03-11	kkmrkkblmbrbk	C-PRP	M5453809/126879052653023274511 : C571B284F3E50C1B
2017-12-02	storm5510	C-PRP	M5453809/126879052653023274511 : C571B284F3E50C1B
2016-06-27	Gordon Spence	F	Factor: 126879052653023274511 / TF: 66-67
2015-08-24	snme2pm1	NF	no factor TF: 65-66
2014-12-30	monst	NF	no factor TF: 64-65
2014-12-30	snme2pm1	NF	no factor TF: 63-64
2010-11-03	Squeeky_Squirrel	NF-PM1	B1=60000, B2=960000, E=6
2009-05-09	GrunwalderGIMP	NF	no factor TF: 62-63
2000-08-17	-anonymous-	C-LL	A98F0345F759168E
2000-06-28	-anonymous-	NF-PM1	B1=25000, B2=225000
1999-03-26	akohler	C-LL	A98F0345F759168E
1998-09-06	akohler	C-LL	A98F0345F759168E
1998-04-21	-anonymous-	NF	no factor TF: 1-62