is 2 16051591 - 1
has 4832011 decimal digits
takes 8.777 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8614FFFF260F0874double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual275476.707268.0000%100000050165742022.42015.9340%499.127369.8989%1.8989%
PrimeNet2650.454563.0769%7000022000000.14754.3203%0.602064.6721%1.5952%
GPU722697.437765.2174%11000030000000.21213.1740%7.649766.3214%1.1040%
Difference+6+469.2695+2.7826%+890000+498657420+22.2080+2.7600%+491.4775+3.5775%+0.7949%

Known prime factors (1 factor, 123.2 bits, 0.00076730% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
160515911191044167282393874816068915982104144938123.164371005019777289950515207157964
22 × 3 × 73 × 227 × 233 × 257 × 1229 × 20809 × 57557 × 21167011
2022-04-2857557211670111.041e+100.95751.7078

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-07-06T00:00:00ANONYMOUSv4_computers1750001925000---0.214--1.544%
2022-04-28T01:29:33alpertronManual testing100000050165742038123.16422.4217.5544.845.934%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-05-06T00:00:00ANONYMOUSv4_computers21265--0.455--
2016-03-16T02:29:41Mark RoseManual testing265266--0.466--
2013-10-28T10:13:00NesowaManual testing266267--0.931--
2016-01-02T16:20:11mikrManual testing267268--1.862--
2017-10-08T22:00:18ramgeisManual testing268269--3.724--
2021-05-07T08:48:32lycornManual testing269270--7.449--
2021-09-08T15:10:42SRBaseManual testing270271--14.90--
2021-09-17T09:43:56-Anonymous-Manual testing271272--29.79--
2022-02-09T12:07:01-Anonymous-Manual testing272273--59.59--
2022-02-09T12:07:01-Anonymous-Manual testing273274--119.2--
2022-02-13T14:28:33-Anonymous-Manual testing274275--238.4--


ECM factoring results:
Total ECM effort:0.831 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.831


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-10-19T00:00:00ANONYMOUSv4_computers0346DC9CD6FB07__8.777
2006-01-15T00:00:00ANONYMOUSv4_computers8614FFFF260F08748.777
2006-08-14T00:00:00ANONYMOUSv4_computers8614FFFF260F08748.777


PRP results:
No PRP results for M16051591


P-1 factor-bounds graph:
B1 = 1000000, B2 = 501657420 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 175000, B2 = 1925000 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
103
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103
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107
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109
TF factor-bounds graph:
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272
271
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2100
2110
2120
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Last modified: 2022-04-28T01:34:05+00:00