is 2 1722557 - 1
has 518542 decimal digits
takes 0.081 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6708126100F6C25Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.249968.6567%36422001234567890.69408.6225%17.943971.3593%2.7026%
PrimeNet2570.011163.1579%80001400000.00102.7941%0.012264.1873%1.0294%
GPU722610.178365.5738%70001100000.00091.3441%0.179266.0365%0.4627%
Difference+6+17.0716+3.0829%+3635200+123346789+0.6931+7.2784%+17.7647+5.3228%+5.3228%

Known prime factors (1 factor, 80.4 bits, 0.00466509% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
172255715503343376857258244417912580.359450009589722060235
5 × 7 × 12857416849201721
2017-05-04712857416849201721147,53847,803,07289,282,827

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-11T06:20:00Carsten Kossendeyleela900001507500---0.011--2.357%
2014-04-04T00:13:00Jocelyn LaroucheManual testing100000100000---0.007--0.885%
2014-05-04T12:46:00Jocelyn LaroucheManual testing150000150000---0.010--1.111%
2014-10-07T22:12:00Jocelyn LaroucheManual testing187261187261---0.013--1.248%
2015-01-09T22:25:00Jocelyn LaroucheManual testing280891280891---0.019--1.525%
2015-02-11T12:22:00Jocelyn LaroucheManual testing373865373865---0.026--1.741%
2015-02-22T09:50:00Jocelyn LaroucheManual testing411251411251---0.028--1.816%
2015-03-06T12:09:00Jocelyn LaroucheManual testing452376452376---0.031--1.894%
2015-03-14T11:30:00Jocelyn LaroucheManual testing497613497613---0.034--1.973%
2015-04-08T16:59:00Jocelyn LaroucheManual testing602111602111---0.041--2.137%
2015-05-01T17:20:00Jocelyn LaroucheManual testing728554728554---0.050--2.309%
2015-05-07T16:18:00Jocelyn LaroucheManual testing801409801409---0.055--2.397%
2015-05-22T00:28:00Jocelyn LaroucheManual testing881549881549---0.060--2.487%
2015-05-26T18:16:00Jocelyn LaroucheManual testing969703969703---0.066--2.580%
2015-06-08T13:43:00Jocelyn LaroucheManual testing10666731066673---0.073--2.674%
2015-06-25T21:15:00Jocelyn LaroucheManual testing11733401173340---0.080--2.770%
2015-07-07T18:13:00Jocelyn LaroucheManual testing12906741290674---0.088--2.867%
2015-07-21T01:19:00Jocelyn LaroucheManual testing14197411419741---0.097--2.967%
2015-07-24T22:03:00Jocelyn LaroucheManual testing15617151561715---0.107--3.068%
2015-08-24T00:58:00mikrMSI3642200123456789---0.694--8.622%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:48Mark RoseManual testing258260--0.067--
2010-04-23T14:39:00Architects Cubedm1_76l260261--0.089--
2016-02-23T16:28:48Mark RoseManual testing261262--0.178--
2010-10-27T20:37:00GrunwalderGIMPManual testing21263--0.927--
2016-02-23T16:28:48Mark RoseManual testing262263--0.570--
2015-05-03T20:03:00snme2pm1Manual testing263264--1.140--
2015-05-03T20:03:00snme2pm1Manual testing264265--2.169--
2015-09-02T13:37:00ramgeisManual testing265266--4.338--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.940 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.940 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025014.88
50000500000010.060


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computers6708126100F6C25F0.081
2015-07-18T19:04:00MadPooManual testing6708126100F6C25F0.081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T13:08:44alpertronManual testing
1550334337685725824441791
602A8882755477__no
2017-10-19T04:01:56Oliver KruseThreadripper
1550334337685725824441791
602A8882755477__no


P-1 factor-bounds graph:
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 1561715 (P-1 stage 1)
B1 = 1419741 (P-1 stage 1)
B1 = 1290674 (P-1 stage 1)
B1 = 1173340 (P-1 stage 1)
B1 = 1066673 (P-1 stage 1)
B1 = 969703 (P-1 stage 1)
B1 = 881549 (P-1 stage 1)
B1 = 801409 (P-1 stage 1)
B1 = 728554 (P-1 stage 1)
B1 = 602111 (P-1 stage 1)
B1 = 497613 (P-1 stage 1)
B1 = 452376 (P-1 stage 1)
B1 = 411251 (P-1 stage 1)
B1 = 373865 (P-1 stage 1)
B1 = 280891 (P-1 stage 1)
B1 = 187261 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 150000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
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Last modified: 2020-04-13T10:22:37+00:00