1 800 083 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 =	69189473430

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		George Woltman	6ED46E20F21C7778	0
Verified	1998-12-21	Ethan O'Connor	6ED46E20F21C7778	1208279
Verified	2015-07-18	MadPoo	6ED46E20F21C7778	59893

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	C2EBAE18FB1D54A5	0	1	3

History

Date	User	Type	Result
2025-09-03	Marvinist	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	C2EBAE18FB1D54A5 PRP proof power = 6 PRP: Verified Proof certified good
2023-08-01	kurly	NF-PM1	B1=25000000, B2=69189473430
2023-05-20	Joss	NF-PM1	B1=1800083, B2=6153904680
2023-02-25	Joss	NF-PM1	B1=1800083, B2=2663771880
2023-01-07	Joss	NF-PM1	B1=1800083, B2=918737820
2022-10-27	masser	NF-PP1	Start=6/5, B1=400000, B2=10800000
2022-10-27	masser	NF-PP1	Start=2/7, B1=800000, B2=25600000
2022-10-27	masser	NF-PP1	Start=146/61, B1=200000, B2=4400000
2021-07-11	Dylan Delgado	NF-PM1	B1=3000000, B2=393000000
2019-07-24	TJAOI	NF	no factor from 2^67 to 2^68
2018-09-17	Joss	NF-PM1	B1=1800083, B2=180008300, E=12
2018-06-18	TJAOI	NF	no factor from 2^66 to 2^67
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
2015-08-30	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-18	MadPoo	C-LL	6ED46E20F21C7778
2015-04-26	mikr	NF-PM1	B1=2780000, B2=91760000, E=12
2015-04-19	snme2pm1	NF	no factor from 2^64 to 2^65
2015-04-19	snme2pm1	NF	no factor from 2^63 to 2^64
2014-09-19	Joss	NF-PM1	B1=171312
2014-05-09	Joss	NF-PM1	B1=135656
2011-02-08	Carsten Kossendey	NF-PM1	B1=100000, B2=1650000, E=6
2011-01-21	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-09	Architects Cubed	NF	no factor from 2^60 to 2^61

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