1 973 519 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

No factors below 2⁷¹

TF target 2⁶²

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

P-1

B1 =	20000000
B2 =	59941201320

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Joel Armengaud	36757F5CD012162C	0
Verified	1999-01-17	al beik	36757F5CD012162C	1851923
Verified	2015-07-12	MadPoo	36757F5CD012162C	220199

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	69F101AEE388ABBA	0	1	3

History

Date	User	Type	Result
2025-09-03	Jurzal	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	69F101AEE388ABBA PRP proof power = 6 PRP: Verified Proof certified good
2022-09-02	RichD0	NF-PM1	B1=20000000, B2=59941201320
2022-08-10	masser	NF-PP1	Start=2/7, B1=1400000, B2=46200000
2018-11-26	Joss	NF-PM1	B1=1973519, B2=246689875, E=12
2018-06-15	ramgeis	NF	no factor from 2^70 to 2^71
2018-05-28	Joss	NF-PM1	B1=1973519, B2=197351900, E=12
2018-03-24	Yxinity	NF	no factor from 2^69 to 2^70
2018-03-24	Yxinity	NF	no factor from 2^68 to 2^69
2018-03-24	Yxinity	NF	no factor from 2^67 to 2^68
2018-03-24	Yxinity	NF	no factor from 2^66 to 2^67
2018-03-05	Joss	NF-PM1	B1=1973519, B2=120000000, E=12
2018-02-14	Joss	NF-PM1	B1=1973519, B2=60000000, E=12
2018-01-20	Joss	NF-PM1	B1=1973519, B2=30000000, E=12
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-09-10	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-12	MadPoo	C-LL	36757F5CD012162C
2015-03-19	lycorn	NF	no factor from 2^64 to 2^65
2015-03-19	lycorn	NF	no factor from 2^63 to 2^64
2011-08-27	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-03-19	kurly	NF-PM1	B1=1000000, B2=30000000, E=12
2009-12-29	S485122	NF	no factor from 2^60 to 2^61

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