is 2 1761437 - 1
has 530246 decimal digits
takes 0.096 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L4325D0B529284897double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26833.838869.1176 %17614371937580700.96148.0131 %34.800271.5923 %
Target2610.174465.5738 %80006000000.00321.4529 %0.177666.0739 %
Difference+7+33.6644+3.5439 %+1753437+193158070+0.9582+6.5602%+34.6226+5.5183 %

Known prime factors (1 factor, 70.9 bits, 0.00402784% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
176143722774564388111761676392270.948646476836472487
17252107 × 37472341
2020-01-111725210737472341135.661.44382.7619

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-02-11Carsten Kossendeymother9500015675006--0.0144.816%
2014-04-08JossManual testing100000100000--0.0082.023%
2014-05-09JossManual testing136439136439--0.0112.336%
2014-09-17ANONYMOUSManual testing172878172878--0.0142.592%
2015-04-30mikrMSI24754008666000012--0.55612.672%
2018-07-10JossManual testing17614378807185012---12.477%
2018-08-13JossManual testing176143717614370012--0.88613.609%
2018-10-19JossManual testing176143719375807012--0.96113.764%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-25ANONYMOUSv4_computers212580.022
2016-02-23Mark RoseManual testing2582600.065
2010-04-19Architects Cubedm1_f22602610.087
2016-02-23Mark RoseManual testing2612620.174
2010-12-13GrunwalderGIMPManual testing212630.906
2016-02-23Mark RoseManual testing2622630.557
2015-04-29snme2pm1Manual testing2632641.115
2015-04-29snme2pm1Manual testing2642652.121
2015-09-07ramgeisManual testing2652664.242
2017-10-16BenGeesManual testing2662678.485
2019-08-16TJAOIManual testing26726816.97


ECM factoring results:
Total ECM effort:38.381 GHz-days
Estimated T-Level:25.718
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024816.90
50000500000030.206
250000400000005021.27


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28ANONYMOUSv4_computers4325D0B5292848970.096
2015-07-18MadPooManual testing4325D0B5292848970.096


PRP results:
dateuseridcompidcofactorsres64
2020-01-15mnd9office2
2277456438811176167639
916F972F3B8DBE76
2020-01-17Luigi Morelli9800X
2277456438811176167639
916F972F3B8DBE76


CERT results:
No CERT results for M1761437


P-1 factor-bounds graph:
B1 = 1761437, B2 = 193758070 (P-1 stage 2)
B1 = 1761437, B2 = 176143700 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 1761437, B2 = 88071850 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1761437 (P-1 stage 1)
B1 = 95000, B2 = 1567500 (P-1 stage 2)
B1 = 172878 (P-1 stage 1)
B1 = 136439 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
103
104
105
106
107
108
103
104
105
106
107
108
109
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.72 ~= 69-bit
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Last modified: 2024-02-29T14:28:04+00:00