121 787 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
79128914868007148177036756481518056714393	41	135.9	2023-07-29 15:59:26

ECM

Estimated T-Level: 35.9 ⓘ

TF below 2^114 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Unknown	2505	0
Verified (Factored)		Jay R. Hill	545F2A5A05C22505	0
Verified (Factored)		Brian J. Beesley	545F2A5A05C22505	0
Verified (Factored)		Eivind Triel	545F2A5A05C22505	56769
Verified (Factored)	2016-06-01	MadPoo	545F2A5A05C22505	104895

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2023-07-29	Oliver Kruse	841CC47756E7CA97	1	95649	5	3

P-1 factors

Date	Factor	B1	B2
2023-07-29	79128914868007148177036756481518056714393	10000000000	756670016752650

History

Date	User	Type	Result
2023-07-29	curtisc	CERT	PRP Certification Proof certified good
2023-07-29	Oliver Kruse	C-PRP	M121787/79128914868007148177036756481518056714393 : 841CC47756E7CA97 PRP proof power = 5 PRP: Verified Proof certified good
2023-07-29	Oliver Kruse	F-PM1	Factor: 79128914868007148177036756481518056714393 / (P-1, B1=10000000000, B2=756670016752650)
2023-02-17	Joss	NF-PM1	B1=1000000, B2=522803591310
2023-01-13	Joss	NF-PM1	B1=1000000, B2=173706132600
2022-04-26	404_factor_not_found	NF	no factor from 2^67 to 2^68
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2021-04-24	Oliver Kruse	NF-PP1	Start=2/7, B1=40000000, B2=4000000000
2020-02-08	Gordon Spence	NF	no factor from 2^66 to 2^67
2019-07-04	Yxinity	NF	no factor from 2^65 to 2^66
2018-05-10	chuenkit	NF	no factor from 2^64 to 2^65
2016-06-01	MadPoo	C-LL	545F2A5A05C22505
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-02-21	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-02-21	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2013-09-13	Sid & Andy	NF	no factor from 2^60 to 2^61
2013-02-15	alpertron	NF-PM1	B1=100000000, B2=2000000000, E=12
2009-01-11	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59
2008-12-29	axn	NF-PM1	B1=17600000, B2=528000000, E=12

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