5 538 257 Exponent Status

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁷²

TF target 2⁶⁶

Factored

Factor	Digits	Bits	Date
789695564721602246969876711	27	89.4	2025-03-31 15:37:39

ECM

Digits	B1	Curves
25	50000	83 / 280

Estimated T-Level: 21.5 ⓘ

TF below 2^66 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored	1999-09-22	Rich Harms	8A6C23D21E3C377B	4942447	Windows,Prime95,v18,(aka WU1)
Factored	2000-09-23	David W. James	8A6C23D21E3C377B	2963733	Windows,Prime95,v20,(aka WW1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	Certified Good	2025-04-10	pilotpsk	02C0406A28E3C69C	1	3004336	5	3

History

Date	User	Type	Result
2025-04-10	Benjamin Michaelis	CERT	Proof certified good
2025-04-10	pilotpsk	C-PRP	M5538257/789695564721602246969876711 : 02C0406A28E3C69C Proof Certified Good Proof Power: 7
2025-03-31	fordobr	F-ECM	Factor: 789695564721602246969876711 / ECM curve 38, B1=50000, B2=64857975, Edwards Sigma=4231381989579883
2021-11-11	axn	NF-PM1	B1=8000000, B2=400000000
2021-10-10	SRBase	NF	no factor TF: 71-72
2021-08-24	SRBase	NF	no factor TF: 70-71
2021-08-19	SRBase	NF	no factor TF: 69-70
2020-08-17	TJAOI	NF	no factor TF: 68-69
2019-09-09	GdS	NF-PM1	B1=200000, B2=6000000
2018-07-05	ramgeis	NF	no factor TF: 67-68
2016-07-25	Gordon Spence	NF	no factor TF: 66-67
2016-02-23	Mark Rose	NF	no factor TF: 1-62
2015-08-31	snme2pm1	NF	no factor TF: 65-66
2014-12-11	monst	NF	no factor TF: 64-65
2014-12-10	Nesowa	NF	no factor TF: 63-64
2009-05-13	Rob_Dee	NF-PM1	B1=65000, B2=1121250
2009-04-24	GrunwalderGIMP	NF	no factor TF: 62-63
2000-09-23	-anonymous-	C-LL	8A6C23D21E3C377B
2000-07-25	-anonymous-	NF-PM1	B1=20000, B2=60000
1999-09-22	rph75243	C-LL	8A6C23D21E3C377B

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