is 2 1400261 - 1
has 421521 decimal digits
takes 0.053 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE19427E6BDD916DCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26721.220368.6567%500000150000000.07144.9074%21.291770.1948%1.5381%
PrimeNet2560.006962.5000%65001100000.00072.7623%0.007563.5358%1.0358%
GPU722600.109765.0000%6000700000.00051.2426%0.110265.4349%0.4349%
Difference+7+21.1106+3.6567%+494000+14930000+0.0709+3.6647%+21.1815+4.7599%+4.7599%

Known prime factors (1 factor, 68.2 bits, 0.00487099% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
14002613405744655082264044072168.207121611065904223
7 × 37 × 469540794997
2014-07-223746954079499772.9051,416.32,645.2

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-09T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.246%
2003-02-16T00:00:00ANONYMOUSv4_computers4096409600---0.001--0.500%
2003-09-21T00:00:00ANONYMOUSv4_computers15000202500---0.001--0.786%
2010-03-31T04:37:00Rob_Deetwopc200000400000---0.012--1.701%
2010-04-01T04:59:00Rob_Deetwopc400000600000---0.023--2.061%
2010-04-02T07:16:00Rob_Deetwopc600000800000---0.034--2.324%
2010-04-03T06:01:00Rob_Deetwopc8000001000000---0.045--2.537%
2010-04-04T06:06:00Rob_Deetwopc10000001200000---0.056--2.717%
2010-04-05T05:33:00Rob_Deetwopc12000001400000---0.067--2.874%
2010-04-06T05:14:00Rob_Deetwopc14000001600000---0.078--3.014%
2010-04-07T06:30:00Rob_Deetwopc16000001800000---0.089--3.140%
2010-04-08T05:51:00Rob_Deetwopc18000002000000---0.100--3.255%
2010-04-09T04:50:00Rob_Deetwopc20000002200000---0.111--3.361%
2010-04-10T03:58:00Rob_Deetwopc22000002400000---0.122--3.459%
2010-04-11T05:58:00Rob_Deetwopc24000002600000---0.133--3.550%
2010-04-12T04:51:00Rob_Deetwopc26000002800000---0.145--3.636%
2010-04-13T06:06:00Rob_Deetwopc28000003000000---0.156--3.717%
2010-04-14T05:36:00Rob_Deetwopc30000003200000---0.167--3.793%
2010-04-15T05:39:00Rob_Deetwopc32000003400000---0.178--3.866%
2010-04-16T04:59:00Rob_Deetwopc34000003600000---0.189--3.935%
2010-04-17T04:40:00Rob_Deetwopc36000003800000---0.200--4.001%
2010-04-18T05:51:00Rob_Deetwopc38000004000000---0.211--4.064%
2010-04-19T05:27:00Rob_Deetwopc40000004200000---0.222--4.124%
2010-04-20T04:55:00Rob_Deetwopc42000004400000---0.233--4.182%
2010-04-21T04:28:00Rob_Deetwopc44000004600000---0.244--4.238%
2010-04-22T05:43:00Rob_Deetwopc46000004800000---0.255--4.291%
2010-04-23T05:38:00Rob_Deetwopc48000005000000---0.266--4.343%
2010-04-24T06:16:00Rob_Deetwopc50000005100000---0.277--4.367%
2016-03-17T19:13:49alpertronManual testing5000001500000012---0.071--4.907%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-05-27T00:00:00Jocelyn Larouchev4_computers21257--0.014--
2003-02-24T00:00:00ANONYMOUSv4_computers21258--0.027--
2003-03-27T00:00:00ANONYMOUSv4_computers21259--0.055--
2009-02-16T18:46:00Sturle Sundegibus.ifi260261--0.110--
2011-01-08T22:47:00BloodIceMjolnir4261262--0.219--
2011-04-05T20:59:00GrunwalderGIMPManual testing21263--1.140--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.367 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.367 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025011.76
50000500000010.047
250000350000005013.56


Lucas-Lehmer results:
No L-L results for M1400261


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:52:44Oliver KruseGTX-2
340574465508226404407
3D5A430E74974C__no
2017-10-25T22:32:45kkmrkkblmbrbkold
340574465508226404407
3D5A430E74974C__no


P-1 factor-bounds graph:
B1 = 5000000, B2 = 5100000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 4800000, B2 = 5000000 (P-1 stage 2)
B1 = 4800000 (P-1 stage 1)
B1 = 4600000, B2 = 4800000 (P-1 stage 2)
B1 = 4600000 (P-1 stage 1)
B1 = 4400000, B2 = 4600000 (P-1 stage 2)
B1 = 4400000 (P-1 stage 1)
B1 = 4200000, B2 = 4400000 (P-1 stage 2)
B1 = 4200000 (P-1 stage 1)
B1 = 4000000, B2 = 4200000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 3800000, B2 = 4000000 (P-1 stage 2)
B1 = 3800000 (P-1 stage 1)
B1 = 3600000, B2 = 3800000 (P-1 stage 2)
B1 = 3600000 (P-1 stage 1)
B1 = 3400000, B2 = 3600000 (P-1 stage 2)
B1 = 3400000 (P-1 stage 1)
B1 = 3200000, B2 = 3400000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 3000000, B2 = 3200000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 2800000, B2 = 3000000 (P-1 stage 2)
B1 = 2800000 (P-1 stage 1)
B1 = 2600000, B2 = 2800000 (P-1 stage 2)
B1 = 2600000 (P-1 stage 1)
B1 = 2400000, B2 = 2600000 (P-1 stage 2)
B1 = 2400000 (P-1 stage 1)
B1 = 2200000, B2 = 2400000 (P-1 stage 2)
B1 = 2200000 (P-1 stage 1)
B1 = 2000000, B2 = 2200000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1800000, B2 = 2000000 (P-1 stage 2)
B1 = 1800000 (P-1 stage 1)
B1 = 1600000, B2 = 1800000 (P-1 stage 2)
B1 = 1600000 (P-1 stage 1)
B1 = 1400000, B2 = 1600000 (P-1 stage 2)
B1 = 1400000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1200000, B2 = 1400000 (P-1 stage 2)
B1 = 1200000 (P-1 stage 1)
B1 = 1000000, B2 = 1200000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 800000, B2 = 1000000 (P-1 stage 2)
B1 = 800000 (P-1 stage 1)
B1 = 600000, B2 = 800000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 400000, B2 = 600000 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
B1 = 200000, B2 = 400000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 15000, B2 = 202500 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 4096 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-09-21T09:29:16+00:00