1 939 787 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
2141977333066081431746808449	28	90.8	2020-01-08 13:26:42

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 640

Estimated T-Level: 25.8 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		Ekim Sahin	788B45970C947B68	0
Verified (Factored)	1999-01-10	Kev Thomas	788B45970C947B68	149763
Verified (Factored)	2015-06-27	MadPoo	788B45970C947B68	912620

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	CC29EDEC95775518	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-01-08	mrh	CC29EDEC95775518	1	293557	5	3
Verified	2020-01-09	marssystems	CC29EDEC95775518	1	1585530	5	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	CC29EDEC95775518 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2020-01-09	marssystems	C-PRP	M1939787/2141977333066081431746808449 : CC29EDEC95775518 PRP: Verified PRP without proof (not generated)
2020-01-08	mrh	C-PRP	M1939787/2141977333066081431746808449 : CC29EDEC95775518 PRP: Verified PRP without proof (not generated)
2020-01-08	Keysarecool	F-ECM	Factor: 2141977333066081431746808449 / (ECM curve 3, B1=50000, B2=5000000, Sigma=686150873592049)
2019-05-10	chuenkit	NF	no factor from 2^67 to 2^68
2018-02-04	mikr	NF-PM1	B1=8000000, B2=320000000, E=12
2018-02-04	Joss	NF-PM1	B1=1939787, B2=28312160, E=12
2017-12-04	TJAOI	NF	no factor from 2^66 to 2^67
2017-04-12	Joss	NF-PM1	B1=1415608, B2=14156080, E=12
2017-01-22	Joss	NF-PM1	B1=1179674
2017-01-04	Joss	NF-PM1	B1=983062
2016-12-24	Joss	NF-PM1	B1=819219
2016-12-17	Joss	NF-PM1	B1=682683
2016-12-15	Joss	NF-PM1	B1=568903
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
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-10-08	Bruno Victal	NF-PM1	B1=500000, B2=15000000, E=12
2015-09-05	ramgeis	NF	no factor from 2^65 to 2^66
2015-06-27	MadPoo	C-LL	788B45970C947B68
2015-05-07	lycorn	NF	no factor from 2^64 to 2^65
2015-05-07	lycorn	NF	no factor from 2^63 to 2^64
2012-01-28	markr	NF-PM1	B1=275000, B2=6000000, E=12
2011-08-27	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-01-29	S485122	NF	no factor from 2^60 to 2^61

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