is 2 1815533 - 1
has 546530 decimal digits
takes 0.098 GHz-days to do one PRP test
Last-known PrimeNet details:
Assigned as ecm on 2020-01-19, 0.0% done, ETC 2022-05-27
0 primality tests remaining
ResidueStatus
L-L64AB9BFE60914948double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26832.830569.1176%18155331815533000.91317.9875%33.743671.5844%2.4667%
PrimeNet2570.010663.1579%80001500000.00122.8748%0.011864.2170%1.0591%
GPU722610.169265.5738%90001300000.00121.5571%0.170466.1098%0.5360%
Difference+7+32.6613+3.5439%+1806533+181423300+0.9119+6.4304%+33.5732+5.4745%+5.4745%

Known prime factors (1 factor, 73.8 bits, 0.00406245% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1815533159396051834356645624232373.7554389786686178567
32 × 43 × 11343118052141
2020-04-2943113431180521411,716.648,61490,797

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-11T06:18:00Carsten Kossendeyleela1000001650000---0.015--2.199%
2014-05-13T21:11:00Jocelyn LaroucheManual testing135353135353---0.011--0.924%
2014-09-22T21:00:00Jocelyn LaroucheManual testing170706170706---0.013--1.050%
2015-05-23T14:13:00mikrMSI278000091760000---0.600--7.484%
2018-09-10T11:51:54Jocelyn Larouchelow 4M181553318155330012---0.913--7.987%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:53Mark RoseManual testing258260--0.063--
2010-04-17T14:28:00Architects Cubeda3_bu2260261--0.085--
2016-02-23T16:28:53Mark RoseManual testing261262--0.169--
2011-01-21T16:10:00GrunwalderGIMPManual testing21263--0.879--
2016-02-23T16:28:53Mark RoseManual testing262263--0.541--
2015-04-23T05:08:00snme2pm1Manual testing263264--1.081--
2015-04-23T05:08:00snme2pm1Manual testing264265--2.058--
2015-09-02T13:37:00ramgeisManual testing265266--4.116--
2018-03-19T15:07:58TJAOIManual testing266267--8.232--
2019-06-24T09:36:04TJAOIManual testing267268--16.46--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.435 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.435 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.3790.023%
25500000.75846.842%
302500000.04795.425%
3510000000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001238.488
50000500000010.069
5000066000001279.88


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computers64AB9BFE609149480.098
2015-07-18T18:31:00MadPooManual testing64AB9BFE609149480.098


PRP results:
dateuseridcompidcofactorsres64PRP
2020-04-29T22:54:50atrenchDesktop
15939605183435664562423
AFEF62996B35FC28no
2020-04-30T09:25:15Klaus Nordmannno1
15939605183435664562423
AFEF62996B35FC28no


P-1 factor-bounds graph:
B1 = 1815533, B2 = 181553300 (P-1 stage 2)
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 1815533 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 170706 (P-1 stage 1)
B1 = 135353 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-27T08:52:01+00:00