is 2 1772087 - 1
has 533452 decimal digits
takes 0.096 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L007E76D41271E66Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26833.635469.1176 %200000003400953055501,459.051019.8840 %1,492.686475.2583 %
Target2610.173365.5738 %80006000000.00321.4547 %0.176566.0746 %
Difference+7+33.4621+3.5439 %+19992000+340094705550+1,459.0478+18.4292%+1,492.5099+9.1837 %

Known prime factors:
No known factors for M1772087

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-02-07Carsten Kossendeymother9500016150006--0.0144.851%
2014-04-10ANONYMOUSManual testing100000100000--0.0082.025%
2014-05-09JossManual testing136220136220--0.0112.337%
2014-09-18JossManual testing172440172440--0.0142.592%
2015-05-16mikrMSI24754008666000012--0.55612.679%
2018-07-05JossManual testing177208717720870012--0.89113.631%
2018-10-19JossManual testing177208719492957012--0.96713.786%
2023-01-07JossManual testing1772087915674760--4.91616.255%
2023-02-25JossManual testing17720872660699580--13.9817.914%
2023-05-11JossManual testing17720876150832380--32.1119.193%
2023-08-01linamentU2K2000000020000000--1.57310.265%
2023-08-01linamentCyber20000000340095305550--1,45928.402%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-08-02masserManual testing1600000576000009329--0.427


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-25ANONYMOUSv4_computers212580.022
2010-04-20Architects Cubedm1_tt2602610.087
2010-12-13GrunwalderGIMPManual testing212630.900
2016-02-23Mark RoseManual testing2582630.792
2015-05-01snme2pm1Manual testing2632653.216
2015-09-11ramgeisManual testing2652664.217
2018-06-04TJAOIManual testing2662678.434
2019-07-24TJAOIManual testing26726816.87


ECM factoring results:
Total ECM effort:36.389 GHz-days
Estimated T-Level:25.674
DigitsB1CompleteFacMiss
201100014.3230.000%
25500001.60620.076%
302500000.13587.398%
3510000000.00999.085%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025817.65
250000400000004418.74


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06ANONYMOUSv4_computers007E76D41271E66B0.096
2015-06-27MadPooManual testing007E76D41271E66B0.096


PRP results:
No PRP results for M1772087


CERT results:
No CERT results for M1772087


P-1 factor-bounds graph:
B1 = 20000000, B2 = 340095305550 (P-1 stage 2)
B1 = 1772087, B2 = 6150832380 (P-1 stage 2)
B1 = 1772087, B2 = 2660699580 (P-1 stage 2)
B1 = 1772087, B2 = 915674760 (P-1 stage 2)
B1 = 20000000 (P-1 stage 1)
B1 = 1772087, B2 = 194929570 (P-1 stage 2)
B1 = 1772087, B2 = 177208700 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1772087 (P-1 stage 1)
B1 = 95000, B2 = 1615000 (P-1 stage 2)
B1 = 172440 (P-1 stage 1)
B1 = 136220 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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267
266
265
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258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.67 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00