is 2 1537801 - 1
has 462925 decimal digits
takes 0.069 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LFFBDA0DC18026921double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.322368.6567%500000150000000.08354.9633%19.405970.2124%1.5557%
PrimeNet2570.012563.1579%65001100000.00082.4167%0.013364.0483%0.8904%
GPU722610.199865.5738%6500550000.00061.0153%0.200365.9233%0.3495%
Difference+6+19.1226+3.0829%+493500+14945000+0.0830+3.9480%+19.2055+4.2891%+4.2891%

Known prime factors (1 factor, 66.4 bits, 0.00431775% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1537801972589642466023020492066.39831622740603824
24 × 3 × 658807095913
2013-09-061665880709591313.9452,324.74,341.9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000290000---0.002--0.992%
2011-02-01T22:44:00James HeinrichWHS800001340000---0.010--2.195%
2016-03-17T19:16:04alpertronManual testing5000001500000012---0.084--4.963%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-18T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2010-04-27T04:50:00Architects Cubeda3_bu2260261--0.100--
2010-05-04T02:59:00GrunwalderGIMPManual testing21263--1.038--


ECM factoring results:

Old Calculation Method

Total ECM effort:30.029 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000299 / 1002.9904.954%
2550000299 / 2801.06834.309%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:30.029 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.1990.001%
25500001.35125.899%
302500000.11389.347%
3510000000.00899.238%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024913.91
250000350000005016.12


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computersFFBDA0DC180269210.069


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T16:20:34Oliver KruseGTX-2
97258964246602302049
0B4538694A0B04__no
2017-10-30T08:06:57ATHec2-1xf
97258964246602302049
0B4538694A0B04__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1340000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2022-05-26T10:12:47+00:00