M6 908 651 Mersenne number exponent details

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M6908651

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is 2 ^6908651 - 1

has 2079712 decimal digits

takes 1.506 GHz-days to do one PRP test

Last-known PrimeNet details:

Exponent is not assigned to anyone

0 primality tests remaining

	Residue	Status
L-L	27951CB50EC71B01	double-checked
PRP	-unknown-	-unknown-

	Trial Factoring			P-1 Factoring				Combined
	Limit	GHz-days	Probability	B1	B2	GHz-days	Probability	GHz-days	Probability
Actual	2⁷²	138.4255	68.0556%	4000000	456818670	9.0652	8.0769%	147.4907	70.6357%
Target	2⁶⁷	4.3010	65.6716%	45000	900000	0.0290	2.2357%	4.3299	66.4391%
Difference	+5	+134.1246	+2.3839%	+3955000	+455918670	+9.0362	+5.8412%	+143.1607	+4.1966%

Known prime factors:
No known factors for M6908651

P-1 results:

										GHz-Days		worth	Factor probability
date	userid	compid	b1	b2	e	stage	factor	digits	bits*	spent	saved	worth	Factor probability
2001-08-24	ANONYMOUS	v4_computers	30000	30000		-		-	-	0.009	-	-	0.234%
2002-04-07	ANONYMOUS	v4_computers	30000	30000		-		-	-	0.009	-	-	0.234%
2011-09-03	Carsten Kossendey	mother	440000	13420000		-		-	-	0.363	-	-	3.510%
2021-11-18	Seth_Tr	Manual testing	3000000	75000000	12	-		-	-	2.189	-	-	5.980%
2021-11-30	Seth_Tr	Manual testing	4000000	456818670		-		-	-	9.065	-	-	8.077%

Trial Factoring results:

			Bits		Factor			GHz-Days		worth
date	userid	compid	from	to	factor	bits*	digits	spent	saved	worth
1998-07-11	ANONYMOUS	v4_computers	2¹	2⁶¹		-	-	0.044	-	-
1998-08-02	ANONYMOUS	v4_computers	2¹	2⁶²		-	-	0.089	-	-
2005-07-01	ANONYMOUS	v4_computers	2¹	2⁶³		-	-	0.231	-	-
2014-02-09	Nesowa	Manual testing	2⁶³	2⁶⁴		-	-	0.284	-	-
2014-02-18	lycorn	Manual testing	2⁶⁴	2⁶⁵		-	-	0.541	-	-
2015-06-21	VictordeHollander	Manual testing	2⁶⁵	2⁶⁶		-	-	1.082	-	-
2016-04-01	Gordon Spence	Manual testing	2⁶⁶	2⁶⁷		-	-	2.163	-	-
2018-05-23	ramgeis	Manual testing	2⁶⁷	2⁶⁸		-	-	4.327	-	-
2019-12-11	mnd9	Manual testing	2⁶⁸	2⁶⁹		-	-	8.653	-	-
2020-12-21	takahashi	Manual testing	2⁶⁹	2⁷⁰		-	-	17.31	-	-
2021-08-11	SRBase	Manual testing	2⁷⁰	2⁷¹		-	-	34.61	-	-
2021-09-25	SRBase	Manual testing	2⁷¹	2⁷²		-	-	69.23	-	-

ECM factoring results:

Total ECM effort:	1.989 GHz-days
Estimated T-Level:	1.154

Digits	B1	Complete	FacMiss
20	11000	0.231	79.392%
25	50000	0.021	97.887%
30	250000	0.001	99.865%

ECM Summary

B1	B2	factor	curves	GHz-days
50000	5000000		6	1.989

	GHz-Days
date	userid	compid	b1	b2	factor	bits*	curve#	stage#	sigma	numcurves	spent
2012-08-19	JimBa	Dell	50000	5000000						3	0.995
2017-03-29	Benoit Germain	ANN-BGERMAIN	50000	5000000						3	0.995

Lucas-Lehmer results:

date	userid	compid	res64	spent (GHz-days)
1999-06-15	ANONYMOUS	v4_computers	27951CB50EC71B01	1.506
2000-01-19	ANONYMOUS	v4_computers	27951CB50EC71B01	1.506
2000-02-23	ANONYMOUS	v4_computers	27951CB50EC71B01	1.506
2000-05-05	ANONYMOUS	v4_computers	27951CB50EC71B01	1.506
2002-05-05	ANONYMOUS	v4_computers	27951CB50EC71B01	1.506

PRP results:
No PRP results for M6908651

P-1 factor-bounds graph:

X = B1; Y = B2
size of marker relates to size of factor
mouse-over any factor marker (circle) to see additional info
mouse-over any stage bound text to see additional info

B1 = 4000000, B2 = 456818670 (P-1 stage 2)

B1 = 3000000, B2 = 75000000 (P-1 stage 2)

B1 = 4000000 (P-1 stage 1)

B1 = 3000000 (P-1 stage 1)

B1 = 440000, B2 = 13420000 (P-1 stage 2)

B1 = 440000 (P-1 stage 1)

B1 = 30000 (P-1 stage 1)

10³

10⁴

10⁵

10⁶

10⁷

10³

10⁴

10⁵

10⁶

10⁷

10⁸

10⁹

TF factor-bounds graph:

2⁷²

2⁷¹

2⁷⁰

2⁶⁹

2⁶⁸

2⁶⁷

2⁶⁶

2⁶⁵

2⁶⁴

2⁶³

2⁶²

2⁶¹

this exponent TF target: 67

TF double-checked to: 67.8

ECM T-Level=1.15 ~= -13-bit

2⁵⁰

2⁶⁰

2⁷⁰

2⁸⁰

Last modified: 2023-03-25T13:08:14+00:00

0M	<	10¹⁰	All tracked exponents
0M	<	2³²	GPU TF range
0M	<	1000M	PrimeNet range
0M	<	193M	low-PrimeNet, low-res
0M	<	385M	low-PrimeNet, high-res
50M	<	146M	PrimeNet wavefront