is 2 1002887 - 1
has 301900 decimal digits
takes 0.030 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L37B72F473488839Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2731,907.337972.6027 %100000009100000002.53717.4171 %1,909.874974.6348 %
Target2600.153166.6667 %4500800000.00040.5774 %0.153566.8591 %
Difference+13+1,907.1847+5.9361 %+9995500+909920000+2.5367+6.8397%+1,909.7214+7.7757 %

Known prime factors (1 factor, 75.3 bits, 0.00750555% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1002887456239184001851960793212375.27222746290658960180
22 × 3 × 5 × 13 × 151 × 193125239081
2015-06-111511931252390817,629.9452.20844.58

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2000-10-28ANONYMOUSv4_computers500001000000--0.0044.093%
2003-11-16ANONYMOUSv4_computers2048204800--0.0010.939%
2006-01-15Jossv4_computers7800078000--0.0031.860%
2006-01-15Jossv4_computers9800098000--0.0042.079%
2006-01-15Jossv4_computers6000060000--0.0031.625%
2009-06-06Rob_Deetwopc200000400000--0.0093.699%
2009-06-06Rob_Deetwopc400000600000--0.0184.304%
2009-06-06Rob_Deetwopc600000800000--0.0264.740%
2009-11-23Rob_Deetwopc8000001000000--0.0355.087%
2009-11-24Rob_Deetwopc10000001200000--0.0435.378%
2009-11-25Rob_Deetwopc12000001400000--0.0525.629%
2009-11-26Rob_Deetwopc14000001600000--0.0615.849%
2009-11-27Rob_Deetwopc16000001800000--0.0696.047%
2009-11-28Rob_Deetwopc18000001900000--0.0786.133%
2009-11-29Rob_Deetwopc20000002100000--0.0866.304%
2009-11-30Rob_Deetwopc22000002300000--0.0956.461%
2009-12-01Rob_Deetwopc24000002500000--0.1036.605%
2009-12-02Rob_Deetwopc26000002700000--0.1126.740%
2009-12-03Rob_Deetwopc28000002900000--0.1216.866%
2009-12-04Rob_Deetwopc30000003100000--0.1296.984%
2009-12-05Rob_Deetwopc32000003300000--0.1387.096%
2009-12-06Rob_Deetwopc34000003500000--0.1467.201%
2009-12-07Rob_Deetwopc36000003700000--0.1557.301%
2009-12-08Rob_Deetwopc38000003900000--0.1647.397%
2009-12-09Rob_Deetwopc40000004100000--0.1727.487%
2009-12-10Rob_Deetwopc42000004300000--0.1817.574%
2009-12-11Rob_Deetwopc44000004500000--0.1897.657%
2009-12-12Rob_Deetwopc46000004700000--0.1987.737%
2009-12-13Rob_Deetwopc48000004900000--0.2077.814%
2009-12-14Rob_Deetwopc50000005100000--0.2157.888%
2021-06-17ViliamF310000000910000000--2.19118.077%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-09-22ANONYMOUSv4_computers2562570.010
2002-12-09ANONYMOUSv4_computers212580.038
2022-03-07LordJuliusManual testing258260
2009-02-17Sturle Sundezumthor.ifi2602610.153
2010-10-29Michael CManual testing2612620.306
2010-10-29Michael CManual testing2622630.979
2010-10-29Michael CManual testing2632641.958
2011-12-10bcp19Manual testing2642653.726
2013-03-19Never Odd Or EvenManual testing2652667.451
2013-03-19Never Odd Or EvenManual testing26626714.90
2013-03-19Never Odd Or EvenManual testing26726829.80
2013-05-24Never Odd Or EvenManual testing26826959.61
2013-05-24Never Odd Or EvenManual testing269270119.2
2014-03-17ramgeisManual testing270271238.4
2014-03-19ramgeisManual testing271272476.9
2014-03-23ramgeisManual testing272273953.8


ECM factoring results:
Total ECM effort:17.263 GHz-days
Estimated T-Level:25.658
DigitsB1CompleteFacMiss
201100014.8080.000%
25500001.62019.795%
302500000.13287.678%
3510000000.00999.129%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002789.51
50000500000030.104
25000025000000447.651


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2009-12-18Rob_Deetwopc37B72F473488839F0.030


PRP results:
dateuseridcompidcofactorsres64
2017-09-28Oliver KruseGTX-2
45623918400185196079321
5D05E53DE77BDC27
2017-10-15Oliver KruseThreadripper-PC
45623918400185196079321
5D05E53DE77BDC27
2017-12-25ATHec2-1xh
45623918400185196079321
5D05E53DE77BDC27


CERT results:
No CERT results for M1002887


P-1 factor-bounds graph:
B1 = 10000000, B2 = 910000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 5000000, B2 = 5100000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 4800000, B2 = 4900000 (P-1 stage 2)
B1 = 4800000 (P-1 stage 1)
B1 = 4600000, B2 = 4700000 (P-1 stage 2)
B1 = 4600000 (P-1 stage 1)
B1 = 4400000, B2 = 4500000 (P-1 stage 2)
B1 = 4400000 (P-1 stage 1)
B1 = 4200000, B2 = 4300000 (P-1 stage 2)
B1 = 4200000 (P-1 stage 1)
B1 = 4000000, B2 = 4100000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 3800000, B2 = 3900000 (P-1 stage 2)
B1 = 3800000 (P-1 stage 1)
B1 = 3600000, B2 = 3700000 (P-1 stage 2)
B1 = 3600000 (P-1 stage 1)
B1 = 3400000, B2 = 3500000 (P-1 stage 2)
B1 = 3400000 (P-1 stage 1)
B1 = 3200000, B2 = 3300000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 3000000, B2 = 3100000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 2800000, B2 = 2900000 (P-1 stage 2)
B1 = 2800000 (P-1 stage 1)
B1 = 2600000, B2 = 2700000 (P-1 stage 2)
B1 = 2600000 (P-1 stage 1)
B1 = 2400000, B2 = 2500000 (P-1 stage 2)
B1 = 2400000 (P-1 stage 1)
B1 = 2200000, B2 = 2300000 (P-1 stage 2)
B1 = 2200000 (P-1 stage 1)
B1 = 2000000, B2 = 2100000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1800000, B2 = 1900000 (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 = 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 = 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 = 50000, B2 = 1000000 (P-1 stage 2)
B1 = 98000 (P-1 stage 1)
B1 = 78000 (P-1 stage 1)
B1 = 60000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.66 ~= 69-bit
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Last modified: 2024-02-09T03:30:02+00:00