is 2 3750631 - 1
has 1129053 decimal digits
takes 0.394 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L08E80066D576BC6Edouble-checked
PRP8B7FAF25D9E79F12verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27063.709468.5714%1600000660000000.77806.1487%64.487570.5039%1.9325%
PrimeNet2600.041063.3333%160003200000.00503.0909%0.045964.4667%1.1333%
GPU722640.949065.6250%220004500000.00692.1107%0.955966.3506%0.7256%
Difference+6+62.7605+2.9464%+1578000+65550000+0.7711+4.0380%+63.5316+4.1533%+4.1533%

Known prime factors (1 factor, 70.6 bits, 0.00188270% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
375063118056755685400142225992270.613240716237953029
3 × 47 × 1707207361369
2021-10-2347170720736136964.66214,16526,456

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-07T09:58:00Carsten Kossendeyleela20000265000---0.005--0.730%
2013-03-16T16:39:00Squeeky_SquirrelT7500_22001100002035000---0.033--2.076%
2015-12-03T03:09:54mikrMSI16000006600000012---0.778--6.149%
2022-03-03T20:38:53Jocelyn LaroucheManual testing9000090000---0.014--0.624%
2022-03-22T11:09:14Jocelyn LaroucheManual testing100000100000---0.015--0.666%
2022-05-25T14:14:03Jocelyn LaroucheManual testing100000130364850---1.096--4.379%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-03-03T00:00:00ANONYMOUSv4_computers21260--0.041--
2009-03-03T17:11:00S485122USB-Z260261--0.041--
2011-05-01T13:12:00markrManual testing21262--0.164--
2012-05-10T01:23:00GrunwalderGIMPManual testing21263--0.426--
2016-02-23T16:29:38Mark RoseManual testing262263--0.262--
2015-01-25T20:42:00VictordeHollanderManual testing263264--0.523--
2015-01-25T20:42:00VictordeHollanderManual testing264265--0.996--
2016-02-26T17:45:26ramgeisManual testing265266--1.992--
2016-11-08T02:48:15Gordon SpenceManual testing266267--3.985--
2019-02-11T13:34:42TJAOIManual testing267268--7.970--
2020-12-07T01:36:30axnManual testing268269--15.94--
2021-03-22T17:40:37axnManual testing269270--31.88--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.705 GHz-days
Estimated T-Level:1.200
DigitsB1CurvesCompleteFacMiss
201100024 / 1000.24078.568%
255000024 / 2800.08691.772%

New Calculation Method

Total ECM effort:3.705 GHz-days
Estimated T-Level:1.200
DigitsB1CompleteFacMiss
20110000.93939.098%
25500000.08791.682%
302500000.00599.453%


ECM Summary

B1B2factorcurvesGHz-days
500005000000192.840
50000670000050.865


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-08-16T00:00:00ANONYMOUSv4_computers08E80066D576BC6E0.394
1999-08-16T00:00:00ANONYMOUSv4_computers08E80066D576BC6E0.394


PRP results:
dateuseridcompidcofactorsres64PRP
2021-10-24T12:05:42kutensterra
1805675568540014222599
8B7FAF25D9E79F12no


P-1 factor-bounds graph:
B1 = 100000, B2 = 130364850 (P-1 stage 2)
B1 = 1600000, B2 = 66000000 (P-1 stage 2)
B1 = 1600000 (P-1 stage 1)
B1 = 110000, B2 = 2035000 (P-1 stage 2)
B1 = 110000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 20000, B2 = 265000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-25T14:14:03+00:00