is 2 3754259 - 1
has 1130145 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-L-unknown--unknown-
PRPA1FF3C23880A4BB9verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27063.647968.5714%1600000660000000.77806.1494%64.425970.5041%1.9327%
PrimeNet2600.040963.3333%160003200000.00503.0914%0.045964.4669%1.1335%
GPU722640.948165.6250%220004500000.00692.1111%0.955066.3507%0.7257%
Difference+6+62.6998+2.9464%+1578000+65550000+0.7711+4.0383%+63.4709+4.1534%+4.1534%

Known prime factors (1 factor, 75.2 bits, 0.00200177% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3754259419680230792685671157192375.1525589388355900401
13 × 1439 × 298785928043
2021-10-3014392987859280433,997.52,479.14,630.2

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-07T17:50:00Carsten Kossendeyleela20000265000---0.005--0.730%
2013-03-17T20:39:00Squeeky_SquirrelP4_26001100002035000---0.033--2.076%
2015-12-15T17:32:38mikrMSI16000006600000012---0.778--6.149%
2022-03-03T20:38:37Jocelyn LaroucheManual testing9000090000---0.014--0.624%
2022-03-22T11:10:11Jocelyn LaroucheManual testing100000100000---0.015--0.666%
2022-05-25T14:13:24Jocelyn LaroucheManual testing100000130364850---1.096--4.380%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-03-04T08:01:00S485122USB-Z260261--0.041--
2011-04-27T11:29:00markrManual testing21262--0.164--
2012-05-10T01:23:00GrunwalderGIMPManual testing21263--0.425--
2016-02-23T16:29:38Mark RoseManual testing262263--0.261--
2015-01-25T20:42:00VictordeHollanderManual testing263264--0.523--
2015-01-25T20:42:00VictordeHollanderManual testing264265--0.995--
2016-02-28T22:17:30ramgeisManual testing265266--1.990--
2016-11-08T02:48:16Gordon SpenceManual testing266267--3.981--
2019-02-04T14:28:11TJAOIManual testing267268--7.962--
2020-12-07T17:57:15axnManual testing268269--15.92--
2021-03-24T08:51:07axnManual testing269270--31.85--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.356 GHz-days
Estimated T-Level:1.050
DigitsB1CurvesCompleteFacMiss
201100021 / 1000.21080.973%
255000021 / 2800.07592.762%

New Calculation Method

Total ECM effort:3.356 GHz-days
Estimated T-Level:1.050
DigitsB1CompleteFacMiss
20110000.83743.321%
25500000.07792.559%
302500000.00599.512%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.794
50000670000020.346
50000675000071.216


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-22T00:00:00Phantomasv4_computers075CEFE16F1F5E__0.394


PRP results:
dateuseridcompidcofactorsres64PRP
2021-10-31T00:17:58kutensspica
41968023079268567115719
A1FF3C23880A4BB9no


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: 2022-05-25T14:13:24+00:00