is 21502201-1
has 452,208 decimal digits
takes 0.067 GHz-days to do one L-L test
Last-known PrimeNet details:
0 L-L tests remaining
ResidueStatus
L-LB649B1C9A0ACB8E8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2654.856767.6923%935,00027,115,0000.15297.0796%5.009674.7719%11.6140%
PrimeNet2570.012863.1579%6,500100,0000.00082.3411%0.013565.4990%2.3411%
GPU722610.204565.5738%6,00050,0000.00050.9483%0.205066.5220%0.9483%
Difference+4+4.6522+2.1185%+929,000+27,065,000+0.1524+6.1313%+4.8046+8.2499%+8.2499%

Known prime factors (1 factor, 132.9 bits, 0.00884513% known):
Remaining cofactor is not a probable-prime

GHz-days
exponentfactordigitsbits*kmin B1min B2date foundmin. TFmin. P-1normal P-1
1502201996185816448431884504581904953775353939140132.8723315754071686917677809367404740695
3 × 5 × 37 × 101 × 29641 × 208513 × 955607 × 2035669 × 4919891
2,035,6694,919,8912015-01-221.017e+110.14200.2683

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-25T19:40:00ANONYMOUSWHS80,0001,280,000---0.009--2.758%
2013-11-13T21:52:00David Campeaui5-2500k935,00027,115,000---0.153--7.080%
2015-01-22T10:36:00VictordeHollanderManual testing10,000,00027,115,00040132.8720.6480.1341.2957.963%
2016-03-17T19:15:32alpertronManual testing500,00015,000,00012---0.084--5.995%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-08-08T00:00:00ANONYMOUSv4_computers?258--0.026--
2010-02-19T05:45:00GrunwalderGIMPManual testing21263--1.062--
2015-01-06T20:58:00snme2pm1Manual testing263264--1.307--
2015-01-06T20:58:00snme2pm1Manual testing264265--2.487--


ECM factoring results:
ECM Summary

B1B2factorcurvesGHz-days
50,0005,000,00025113.99


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-11T00:00:00BJBv4_computersB649B1C9A0ACB8E80.067


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T09:46:36Oliver KruseGTX-0
9961858164484318845045819049537753539391
43EDD8392009BFA5no
2017-10-29T06:19:12Chang Chia-Tchehomura
9961858164484318845045819049537753539391
43EDD8392009BF__no


P-1 factor-bounds graph:
B1 = 10,000,000, B2 = 27,115,000 (stage 2)
B1 = 10,000,000 (stage 1)
B1 = 935,000, B2 = 27,115,000 (stage 2)
B1 = 500,000, B2 = 15,000,000 (stage 2)
B1 = 935,000 (stage 1)
B1 = 500,000 (stage 1)
B1 = 80,000, B2 = 1,280,000 (stage 2)
B1 = 80,000 (stage 1)
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TF factor-bounds graph:
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Last modified: 2019-05-10T12:41:21+00:00