M887 Mersenne number exponent details

	Trial Factoring	P-1 Factoring	Combined
Limit	GHz-days	Probability	B1	B2	GHz-days	Probability	GHz-days	Probability
Actual	unknown	-	-	-	-	0.0000	0.0000%
Target	2⁴⁴	0.0026	77.2727%	500	50000	0.0000	0.5820%	0.0026	77.4050%
Difference	-44	-0.0026	-77.2727%	-500	-50000	0.0000	-0.5820%	-0.0026	-77.4050%

	P-1	GHz-days
exponent	factor	digits	bits*	k	date found	min B1	min B2	min. TF	min. P-1	normal P-1
887	16173559	8	23.947	9117 3² × 1013	-	9	1013	2.486e-9	1.219e-9	1.978e-9
887	139714099995626040378049	24	76.887	78756538892686606752 2⁵ × 3 × 820380613465485487	-	32	820380613465485487	21,107,766	855,133	1,597,150
887	2382154297313396649423300881	28	90.944	1342815274697517840712120 2³ × 5 × 1777 × 1182491857 × 15976097227	-	1182491857	15976097227	4.907e+11	0.0380	0.0460
887	19589057566104801654143607987082086171779538810530 51177851547528988145879	73	240.149	11042309789236077595345889507938041810473246229160 37868011018900218797 3 × 11 × 13² × 37 × 41 × 173 × 317 × 2379952757809127675330308058119536980359069420142904032513	2010-02-12	317	2379952757809127675330308058119536980359069420142904032513	1.597e+14	2.481e+45	4.633e+45
887	hide decimal representation P137 click to show decimal representation	137	455.073		2010-02-12

exponent	prime factors	composite factor	digits	bits*
887	16173559 139714099995626040378049	2259674239411157505990757806391	31	100.834
887	16173559 2382154297313396649423300881	38527913074701762199850072773605479	35	114.891
887	139714099995626040378049 2382154297313396649423300881	33282054369985418410748614715444284879637071476116 9	51	167.831
887	16173559 139714099995626040378049 2382154297313396649423300881	53828926999416699380592895426850635271361807410619 37730471	58	191.778
887	16173559 19589057566104801654143607987082086171779538810530 51177851547528988145879	31682477829979240973658923825194335854236050594490 505355001497201393987674613361	80	264.096
887	139714099995626040378049 19589057566104801654143607987082086171779538810530 51177851547528988145879	27368675476108411219609693262331814805687829576048 1973925406379668152102058900601237528721410071	96	317.036
887	2382154297313396649423300881 19589057566104801654143607987082086171779538810530 51177851547528988145879	46664157661416059819328309768421254052279316169798 95700861765616270147554094455098435814660137219399	100	331.093
887	16173559 139714099995626040378049 19589057566104801654143607987082086171779538810530 51177851547528988145879	44264888756469247925661933095022608433686564723016 05073719021680539258443623650349250643789920346512 689	103	340.983
887	16173559 2382154297313396649423300881 19589057566104801654143607987082086171779538810530 51177851547528988145879	75472550712221466703543575840983748926852860455189 74493173411703891659140485236110740245611879426604 5671041	107	355.040
887	139714099995626040378049 2382154297313396649423300881 19589057566104801654143607987082086171779538810530 51177851547528988145879	65196407897187423818002281545495146756281219585462 87494853797427560202838676567639379772828633778244 51533404287765616572551	123	407.980
887	16173559 139714099995626040378049 2382154297313396649423300881 19589057566104801654143607987082086171779538810530 51177851547528988145879	10544579497132267331784651627106769402763729255574 39350289800890686931666633029486329994792505053018 3058518154719030177807531379009	131	431.927

ECM factoring results:

Total ECM effort:	0.429 GHz-days
Estimated T-Level:	27.143

Digits	B1	Complete	FacMiss
20	11000	3.000	4.979%
25	50000	1.200	30.119%
30	250000	0.429	65.144%
35	1000000	0.133	87.517%
40	3000000	0.035	96.552%
45	11000000	0.008	99.180%
50	44000000	0.002	99.826%

ECM Summary

B1	B2	factor	curves	GHz-days
		19589057566104801654143607987082086171779538810530 51177851547528988145879	1	0.00000e+0
260000000	26000000000		6	0.429

	GHz-Days
date	userid	compid	b1	b2	factor	bits*	curve#	stage#	sigma	numcurves	spent
2009-07-07	Rob_Dee	twopc	260000000	26000000000						1	0.072
2009-07-14	Rob_Dee	twopc	260000000	26000000000						1	0.072
2009-07-15	Rob_Dee	twopc	260000000	26000000000						1	0.072
2009-07-17	Rob_Dee	twopc	260000000	26000000000						1	0.072
2009-07-23	Rob_Dee	twopc	260000000	26000000000						1	0.072
2009-10-12	Carsten Kossendey	durandal	260000000	26000000000						1	0.072
2010-02-12	ANONYMOUS	Manual testing			19589057566104801654143607987082086171779538810530 51177851547528988145879	240.149		1		1	-

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

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TF factor-bounds graph:

this exponent TF target: 44

TF double-checked to: 67.9

ECM T-Level=27.14 ~= 74-bit

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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