1 624 591 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with both PRP and Lucas-Lehmer tests

No factors below 2⁶⁸

TF target 2⁶¹

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

P-1

B1 =	25000000
B2 =	611144523990

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	128 / 640

Estimated T-Level: 26.0 ⓘ

Status	Date	User	Residue	Shift
Verified		Jim Carlson	35EEFC5C8B08F1E6	0
Verified	1998-11-07	Nuutti Kuosa	35EEFC5C8B08F1E6	637709
Verified	2015-06-27	MadPoo	35EEFC5C8B08F1E6	1118373

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	CC0F6B7D149A1865	0	1	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	CC0F6B7D149A1865 PRP proof power = 6 PRP: Verified Proof certified good
2022-11-19	Naegi Makoto	NF-PM1	B1=25000000, B2=611144523990
2021-06-09	Team_Inspector	NF-PP1	Start=2/7, B1=1000000, B2=50000000
2019-08-06	TJAOI	NF	no factor from 2^67 to 2^68
2018-02-24	VictordeHollander	NF-PM1	B1=10000000, B2=200000000, E=12
2018-02-18	Joss	NF-PM1	B1=2000000, B2=80000000, E=12
2018-02-07	Joss	NF-PM1	B1=2000000, B2=40000000, E=12
2017-11-17	TJAOI	NF	no factor from 2^66 to 2^67
2017-08-22	Joss	NF-PM1	B1=2000000, B2=20000000, E=12
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2015-10-11	ramgeis	NF	no factor from 2^65 to 2^66
2015-06-27	MadPoo	C-LL	35EEFC5C8B08F1E6
2015-04-30	monst	NF	no factor from 2^64 to 2^65
2015-04-29	omylist	NF	no factor from 2^63 to 2^64
2011-12-01	BigBrother	NF-PM1	B1=1000000, B2=20000000, E=12
2010-08-22	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-05-07	Architects Cubed	NF	no factor from 2^60 to 2^61

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