5 503 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 =	3000000000000
B2 =	9003097235187695640

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	48713 / 105362

Estimated T-Level: 57.3 ⓘ

TF below 2^185 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Verified		Unknown	2C62	0	Unknown,(aka U)
Verified		George Woltman	5CB15D1C3CED2C62	0	Woltman,Prime95,first web release,(aka W4)
Verified		Brian J. Beesley	5CB15D1C3CED2C62	0	Mac,John Sweeney,v1.4,(aka J3)
Verified	2015-04-11	MadPoo 🙂	5CB15D1C3CED2C62	4807	Windows 64-bit,Prime95,v26,(aka We4)

History

Date	User	Type	Result
2026-02-16	-anonymous-	NF-PM1	B1=3000000000000, B2=9003097235187695640
2025-03-01	One Man	NF-PM1	B1=846339636937, B2=761973906564370500
2024-07-14	MooMoo2	NF-PM1	B1=120000000000, B2=157305168281371110
2023-08-15	masser	NF-PP1	Start=6/5, B1=1610000000, B2=288190000000
2023-07-11	masser	NF-PM1	B1=72000000000, B2=51696085487496450
2023-07-10	masser	NF-PP1	Start=171/43, B1=1610000000, B2=64400000000
2023-01-21	masser	NF-PM1	B1=11250000000, B2=7546752410447250
2022-11-18	Joss	NF-PM1	B1=1420000000, B2=2047793501303550
2022-11-18	Joss	NF-PM1	B1=1420000000, B2=1025671265288670
2022-11-17	Joss	NF-PM1	B1=1420000000, B2=67431669024720
2022-02-28	Anton Repko	NF	no factor TF: 64-66
2021-05-13	ATH	NF-PP1	Start=2/7, B1=1000000000, B2=241000000000
2021-02-03	Ruslan Borisov	NF	no factor TF: 64-65
2017-07-03	snme2pm1	NF	no factor TF: 63-64
2016-11-26	-anonymous-	NF-PM1	B1=100000000000, B2=1000000000000, E=12
2016-05-06	Joss	NF-PM1	B1=4911327684, B2=157162485888, E=12
2016-05-04	mikr	NF-PM1	B1=50000000000, B2=3200000000000, E=12
2016-02-23	LaurV	NF	no factor TF: 57-58
2016-01-21	snme2pm1	NF	no factor TF: 62-63
2015-07-23	Sid & Andy	NF	no factor TF: 61-62
2015-04-11	MadPoo 🙂	C-LL	5CB15D1C3CED2C62
2015-01-30	Jayder	NF-PM1	B1=2455663842, B2=157162485888, E=12
2012-10-11	bcp19	NF	no factor TF: 60-61
2011-05-05	Joss	NF-PM1	B1=10000000000
2011-01-18	monst	NF	no factor TF: 58-60
2011-01-02	Matteo2D	NF-PM1	B1=5000000000, B2=15000000000, E=12
2003-01-16	-anonymous-	NF-PM1	B1=4290000000
2002-12-31	-anonymous-	NF	no factor TF: 1-57
2002-09-29	-anonymous-	NF-PM1	B1=3221225472, B2=4290000000, E=48
2002-08-10	-anonymous-	NF-PM1	B1=2147483648, B2=4290000000, E=48
2002-06-02	-anonymous-	NF-PM1	B1=1073741824, B2=4290000000, E=48
2001-07-22	-anonymous-	NF-PM1	B1=3000000000, B2=4290000000
2001-06-17	-anonymous-	NF-PM1	B1=43000000, B2=4290000000
2001-02-11	-anonymous-	NF-PM1	B1=1000000, B2=100000000
2000-08-10	-anonymous-	NF	no factor TF: 1-56
2000-02-16	-anonymous-	NF	no factor TF: 54-55
1999-12-30	-anonymous-	NF	no factor TF: 53-54
1999-09-22	-anonymous-	NF	no factor TF: 52-53

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