M6 923 821 Mersenne number exponent details

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M6923821

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is 2 ^6923821 - 1

has 2084278 decimal digits

takes 1.510 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	EA6FADD57E671552	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	138.1222	68.0556%	4000000	414323910	8.3331	7.9717%	146.4554	70.6021%
Target	2⁶⁷	4.2915	65.6716%	45000	900000	0.0290	2.2365%	4.3205	66.4394%
Difference	+5	+133.8307	+2.3839%	+3955000	+413423910	+8.3042	+5.7352%	+142.1349	+4.1627%

Known prime factors:
No known factors for M6923821

P-1 results:

										GHz-Days		worth	Factor probability
date	userid	compid	b1	b2	e	stage	factor	digits	bits*	spent	saved	worth	Factor probability
2001-08-31	delta_t	v4_computers	30000	30000		-		-	-	0.009	-	-	0.234%
2011-03-28	Carsten Kossendey	leela	440000	13310000		-		-	-	0.361	-	-	3.505%
2021-06-02	Dylan Delgado	Manual testing	630000	18900000	12	-		-	-	0.514	-	-	3.947%
2021-11-27	Seth_Tr	Manual testing	4000000	110000000	12	-		-	-	3.091	-	-	6.531%
2021-12-02	Seth_Tr	Manual testing	4000000	414323910		-		-	-	8.333	-	-	7.972%

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	-	-
1998-07-29	ANONYMOUS	v4_computers	2¹	2⁶²		-	-	0.089	-	-
2005-02-12	ANONYMOUS	v4_computers	2¹	2⁶³		-	-	0.231	-	-
2014-02-09	Nesowa	Manual testing	2⁶³	2⁶⁴		-	-	0.284	-	-
2014-02-17	lycorn	Manual testing	2⁶⁴	2⁶⁵		-	-	0.540	-	-
2015-06-26	VictordeHollander	Manual testing	2⁶⁵	2⁶⁶		-	-	1.079	-	-
2016-04-02	Gordon Spence	Manual testing	2⁶⁶	2⁶⁷		-	-	2.159	-	-
2018-02-27	-Anonymous-	Manual testing	2⁶⁷	2⁶⁸		-	-	4.317	-	-
2020-05-01	TJAOI	Manual testing	2⁶⁸	2⁶⁹		-	-	8.634	-	-
2021-07-19	takahashi	Manual testing	2⁶⁹	2⁷⁰		-	-	17.27	-	-
2021-08-10	SRBase	Manual testing	2⁷⁰	2⁷¹		-	-	34.54	-	-
2021-09-28	SRBase	Manual testing	2⁷¹	2⁷²		-	-	69.07	-	-

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
2012-10-21	Donna Noble	i7-2600k	50000	5000000						3	0.995
2017-04-06	Claude Portenier	Viel-Idiot	50000	5000000						3	0.995

Lucas-Lehmer results:

date	userid	compid	res64	spent (GHz-days)
1999-03-15	ANONYMOUS	v4_computers	B62891B0A2DE14__	1.510
1999-09-14	ANONYMOUS	v4_computers	EA6FADD57E671552	1.510
2001-09-30	delta_t	v4_computers	EA6FADD57E671552	1.510

PRP results:
No PRP results for M6923821

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 = 414323910 (P-1 stage 2)

B1 = 4000000, B2 = 110000000 (P-1 stage 2)

B1 = 4000000 (P-1 stage 1)

B1 = 630000, B2 = 18900000 (P-1 stage 2)

B1 = 440000, B2 = 13310000 (P-1 stage 2)

B1 = 630000 (P-1 stage 1)

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: 67.7

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

2⁵⁰

2⁶⁰

2⁷⁰

2⁸⁰

Last modified: 2023-03-23T17:39:31+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