is 2 1351387 - 1
has 406809 decimal digits
takes 0.052 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L0A4011B4CE4CB56Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26721.987768.6567 %42580861631380920.71508.8786 %22.702771.4395 %
Target2600.113765.0000 %55002000000.00090.9819 %0.114565.3436 %
Difference+7+21.8741+3.6567 %+4252586+162938092+0.7141+7.8967%+22.5881+6.0959 %

Known prime factors (2 factors, 151.8 bits, 0.01123424% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1351387135760661728572396064732373.5235023011976901228
22 × 1255752994225307
2015-12-01412557529942253071,415.53,787,6827,074,336
13513873706909414863804719590972478.295137152030279402004
22 × 23 × 3001 × 496762058587
2018-08-17300149676205858745,2991,498.42,798.5

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-02-09ANONYMOUSv4_computers204820480012--0.0011.014%
2003-02-16ANONYMOUSv4_computers409640960012--0.0011.725%
2003-09-21Xyzzyv4_computers15000187500--0.0012.197%
2003-09-21Team Prime Ribv4_computers15000187500--0.0012.197%
2014-05-09JossManual testing178567178567--0.0122.851%
2014-07-22mikrMSI425808616313809212--0.71514.773%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-11-04ANONYMOUSv4_computers212570.014
2003-02-16ANONYMOUSv4_computers212580.028
2003-03-27ANONYMOUSv4_computers212590.028
2022-03-07LordJuliusManual testing259260
2009-02-19Sturle Sundegibus.ifi2602610.114
2011-05-09XyzzyManual testing2612620.227
2013-01-14dbaughManual testing2622630.726
2015-04-14snme2pm1Manual testing2632641.453
2015-04-14snme2pm1Manual testing2642652.765
2015-09-18ramgeisManual testing2652665.530


ECM factoring results:
Total ECM effort:29.078 GHz-days
Estimated T-Level:25.704
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001698.852
50000500000020.094
500005000000804.377
250000350000005015.76


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-11-13MadPooManual testing0A4011B4CE4CB56D0.060


PRP results:
dateuseridcompidcofactorsres64
2017-09-30Oliver KruseGTX-2
13576066172857239606473
CC4AF62CDA38919B
2017-10-24kkmrkkblmbrbkc4.xlarge
13576066172857239606473
CC4AF62CDA38919B
2018-08-17Oliver KruseGTX-7
13576066172857239606473
370690941486380471959097
D196992B35326925
2018-08-17ATHec2-PRPCFDC
13576066172857239606473
370690941486380471959097
D196992B35326925


CERT results:
No CERT results for M1351387


P-1 factor-bounds graph:
B1 = 4258086, B2 = 163138092 (P-1 stage 2)
B1 = 4258086 (P-1 stage 1)
B1 = 178567 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 15000, B2 = 187500 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 4096 (P-1 stage 1)
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=25.7 ~= 69-bit
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Last modified: 2024-02-09T03:30:02+00:00