1 969 021 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 2⁶²

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

P-1

B1 =	32000000
B2 =	123058885950

ECM

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

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Homme A. Piest	82BD20CA420A2EF1	0
Verified	1999-01-29	Louis Towles	82BD20CA420A2EF1	985151
Verified	2015-07-12	MadPoo	82BD20CA420A2EF1	1484351

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	379B519BD51A4116	0	1	3

History

Date	User	Type	Result
2025-09-03	Kriesel	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	379B519BD51A4116 PRP proof power = 6 PRP: Verified Proof certified good
2022-10-19	RichD0	NF-PM1	B1=32000000, B2=123058885950
2022-08-17	masser	NF-PP1	Start=2/7, B1=1500000, B2=52500000
2019-05-18	chuenkit	NF	no factor from 2^67 to 2^68
2018-11-26	Joss	NF-PM1	B1=1969021, B2=246127625, E=12
2018-09-18	Joss	NF-PM1	B1=1969021, B2=196902100, E=12
2018-03-04	Joss	NF-PM1	B1=1969021, B2=120000000, E=12
2018-02-14	Joss	NF-PM1	B1=1969021, B2=60000000, E=12
2018-01-31	Joss	NF-PM1	B1=1969021, B2=30000000, E=12
2017-11-17	TJAOI	NF	no factor from 2^66 to 2^67
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
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-09-09	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-12	MadPoo	C-LL	82BD20CA420A2EF1
2015-04-14	lycorn	NF	no factor from 2^64 to 2^65
2015-04-14	lycorn	NF	no factor from 2^63 to 2^64
2011-08-27	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-04-21	kurly	NF-PM1	B1=1000000, B2=30000000, E=12
2010-01-02	S485122	NF	no factor from 2^60 to 2^61

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