is 2 4015937 - 1
has 1208918 decimal digits
takes 0.501 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L32C33A49C5D458D6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual271119.045369.0141 %620000031912850970315.499313.5813 %434.544573.2224 %
Target2651.816766.1538 %2200018000000.02151.7504 %1.838266.7463 %
Difference+6+117.2286+2.8602 %+6178000+31911050970+315.4778+11.8309%+432.7063+6.4761 %

Known prime factors:
No known factors for M4015937

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-11-21USAFSSP4_2600400006100004--0.0132.331%
2013-06-19Squeeky_SquirrelP4_260012000022800006--0.0433.895%
2015-01-03Nesowanewfs22500045562506--0.0734.910%
2017-11-15mikrS064460000012500000012--1.77911.009%
2022-06-02DRobinsonPEManual testing620000031912850970--333.119.578%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-06-04ATH5960X250000016500000027--1.989


Trial Factoring results:
575859606162636465666768697071
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-05-23ANONYMOUSv4_computers212600.019
1998-09-06Gimarelv4_computers212610.038
2009-11-07GrunwalderGIMPManual testing212630.397
2016-02-23Mark RoseManual testing2612630.367
2013-07-28JayderManual testing2632640.489
2013-10-23David CampeauManual testing2642650.930
2015-05-18snme2pm1Manual testing2652661.861
2016-09-01kkmrkkblmbrbkManual testing2662673.722
2018-09-18mikrManual testing2672687.443
2019-08-17mikrManual testing26827044.66
2022-03-25mikrManual testing27027159.54


ECM factoring results:
Total ECM effort:3.597 GHz-days
Estimated T-Level:4.038
DigitsB1CompleteFacMiss
20110000.80844.589%
25500000.07592.799%
302500000.00599.530%


ECM Summary

B1B2factorcurvesGHz-days
500005000000213.597


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07Gimarelv4_computers32C33A49C5D458D60.501
2015-11-14MadPooManual testing32C33A49C5D458D60.501


PRP results:
No PRP results for M4015937


CERT results:
No CERT results for M4015937


P-1 factor-bounds graph:
B1 = 6200000, B2 = 31912850970 (P-1 stage 2)
B1 = 4600000, B2 = 125000000 (P-1 stage 2)
B1 = 6200000 (P-1 stage 1)
B1 = 4600000 (P-1 stage 1)
B1 = 225000, B2 = 4556250 (P-1 stage 2)
B1 = 120000, B2 = 2280000 (P-1 stage 2)
B1 = 225000 (P-1 stage 1)
B1 = 120000 (P-1 stage 1)
B1 = 40000, B2 = 610000 (P-1 stage 2)
B1 = 40000 (P-1 stage 1)
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TF factor-bounds graph:
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260
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=4.04 ~= -3-bit
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Last modified: 2024-03-13T02:15:48+00:00