is 2 4999537 - 1
has 1505011 decimal digits
takes 0.693 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP21641E946B413C__verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272191.284468.0556%50000000250000000036.877511.4542%228.161971.7145%3.6590%
PrimeNet2610.061462.2951%220004500000.00913.3132%0.070663.5443%1.2492%
GPU722651.459364.6154%340007000000.01412.4160%1.473465.4703%0.8549%
Difference+7+189.8252+3.4402%+49966000+2499300000+36.8634+9.0382%+226.6885+6.2443%+6.2443%

Known prime factors (1 factor, 77.3 bits, 0.00154546% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
49995371816899653168714513722092477.26618170679136575192
23 × 3 × 66883 × 11319941251
2021-10-2166883113199412516,933.2123.97231.52

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-09-16T16:27:00Carsten Kossendeydurandal25000362500---0.009--0.682%
2011-07-10T02:04:00Squeeky_SquirrelT7500_220060000990000---0.022--1.209%
2011-12-09T09:45:00Squeeky_SquirrelT7500_22001200002430000---0.049--1.814%
2017-02-08T20:25:50Squeeky_Squirreli5-5250U_1600300000937500012---0.160--2.942%
2020-05-19T16:44:42timbitManual testing500000025000000012---3.688--7.323%
2021-10-21T17:42:04timbitManual testing500000002500000000122477.26636.881.38673.7511.454%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-03-08T00:00:00Stephan Gruppv4_computers21261--0.061--
2008-09-02T18:58:00Sturle Sundelara261262--0.061--
2011-08-27T22:57:00GrunwalderGIMPManual testing21263--0.319--
2016-02-23T16:39:06Mark RoseManual testing262263--0.196--
2014-11-06T16:29:00lycornManual testing263264--0.393--
2014-11-06T16:30:00lycornManual testing264265--0.747--
2015-07-31T23:30:00snme2pm1Manual testing265266--1.495--
2017-05-13T06:59:23YxinityManual testing266267--2.989--
2018-06-05T09:54:18ramgeisManual testing267268--5.979--
2020-12-28T10:15:13TJAOIManual testing268269--11.96--
2021-01-07T05:31:04YxinityManual testing269270--23.91--
2021-04-24T23:58:59-Anonymous-Manual testing270271--47.83--
2021-04-27T10:27:34-Anonymous-Manual testing271272--95.66--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.897


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-04-12T00:00:00Stephan Gruppv4_computers2DF8B131A8611F__0.693


PRP results:
dateuseridcompidcofactorsres64PRP
2021-10-28T23:09:11kutenselaine1
181689965316871451372209
21641E946B413C__no


P-1 factor-bounds graph:
B1 = 50000000, B2 = 2500000000 (P-1 stage 2)
B1 = 50000000 (P-1 stage 1)
B1 = 5000000, B2 = 250000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 300000, B2 = 9375000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 120000, B2 = 2430000 (P-1 stage 2)
B1 = 120000 (P-1 stage 1)
B1 = 60000, B2 = 990000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 25000, B2 = 362500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-10-28T23:09:11+00:00