3 881 Exponent Status

PrimeNet Exponent Status

M_n

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁶

TF target 2⁴⁴

P-1

B1 =	2000000000000
B2 =	9223372036854775807

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	9201 / 9201
50	44000000	16550 / 16550
55	110000000	40830 / 40830
60	260000000	105362 / 105362
65	800000000	194238 / 194238
70	2400000000	135530 / 350860

Estimated T-Level: 66.9 ⓘ

TF below 2^217 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Verified		Unknown	3943	0	Unknown,(aka U)
Verified		George Woltman	AF8B303619F03943	0	Woltman,Prime95,first web release,(aka W4)
Verified		Brian J. Beesley	AF8B303619F03943	0	Mac,John Sweeney,v1.4,(aka J3)
Verified	2015-04-11	MadPoo 🙂	AF8B303619F03943	887	Windows 64-bit,Prime95,v26,(aka We4)

History

Date	User	Type	Result
2025-06-20	-anonymous-	NF-PM1	B1=4000000000000, B2=1.2016700776796E+19
2025-03-22	Kamil Gorski	NF-PM1	B1=2000000000000, B2=9.2485357872384E+18
2025-03-18	Kamil Gorski	NF-PM1	B1=2000000000000, B2=44905267485138060
2024-10-11	timc995	NF-PM1	B1=216000000000, B2=1000182848193929400
2024-10-11	timc995	NF-PM1	B1=216000000000, B2=300075563567920140
2023-08-13	masser	NF-PP1	Start=6/5, B1=2390000000, B2=427810000000
2023-07-11	masser	NF-PP1	Start=104/19, B1=2390000000, B2=95600000000
2023-07-07	masser	NF-PM1	B1=72000000000, B2=90401203222730400
2022-03-17	Anton Repko	NF	no factor TF: 65-66
2021-05-13	ATH	NF-PP1	Start=2/7, B1=1000000000, B2=241000000000
2021-01-30	Anton Repko	NF	no factor TF: 64-65
2018-05-08	snme2pm1	NF	no factor TF: 63-64
2016-11-29	snme2pm1	NF	no factor TF: 62-63
2016-02-23	LaurV	NF	no factor TF: 57-58
2015-07-31	snme2pm1	NF	no factor TF: 61-62
2015-04-11	MadPoo 🙂	C-LL	AF8B303619F03943
2012-09-29	bcp19	NF	no factor TF: 60-61
2012-08-16	BloodIce	NF-PM1	B1=200000000000, B2=2000000000000, E=12
2012-07-16	BloodIce	NF-PM1	B1=100000000000
2011-04-23	Joss	NF-PM1	B1=10000000000
2011-02-11	monst	NF	no factor TF: 58-60
2003-01-25	-anonymous-	NF	no factor TF: 1-57
2002-12-31	-anonymous-	NF-PM1	B1=4290000000
2002-09-22	-anonymous-	NF-PM1	B1=3221225472, B2=4290000000, E=48
2002-08-03	-anonymous-	NF-PM1	B1=2147483648, B2=4290000000, E=48
2002-06-02	-anonymous-	NF-PM1	B1=1073741824, B2=4290000000, E=48
2001-06-23	-anonymous-	NF-PM1	B1=3000000000, B2=4290000000
2001-06-09	-anonymous-	NF-PM1	B1=43000000, B2=4290000000
2001-02-11	-anonymous-	NF-PM1	B1=1000000, B2=100000000
2000-08-17	-anonymous-	NF	no factor TF: 1-56
2000-02-09	-anonymous-	NF	no factor TF: 54-55
1999-12-23	-anonymous-	NF	no factor TF: 53-54
1999-09-22	-anonymous-	NF	no factor TF: 52-53

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