is 2 1724389 - 1
has 519093 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-L04CDD9CC965160A1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.231668.6567%117308611730860.08012.7697%17.311669.5248%0.8681%
PrimeNet2570.011163.1579%80001400000.00102.7947%0.012264.1875%1.0296%
GPU722610.178165.5738%70001100000.00091.3444%0.179066.0366%0.4628%
Difference+6+17.0534+3.0829%+1166086+1063086+0.0792+1.4253%+17.1326+3.4882%+3.4882%

Known prime factors (2 factors, 148.6 bits, 0.00861562% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
172438934062191921310099502812271.529987659742706260
22 × 3 × 5 × 13 × 1266230439367
2020-05-18131266230439367536.584,707.88,792.8
17243891551583294762999773051432477.03844989364196912639
3 × 72 × 97 × 15647 × 201646043
2015-07-041564720164604324,1240.75071.4002

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
172438952850327968115957687631560369904421279559518345148.567
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:50:00Carsten 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%
2014-10-01T22:53:00Jocelyn LaroucheManual testing187221187221---0.013--1.248%
2015-01-09T22:25:00Jocelyn LaroucheManual testing280831280831---0.019--1.525%
2015-02-11T12:22:00Jocelyn LaroucheManual testing373785373785---0.026--1.741%
2015-02-22T09:50:00Jocelyn LaroucheManual testing411163411163---0.028--1.816%
2015-03-06T12:09:00Jocelyn LaroucheManual testing452279452279---0.031--1.894%
2015-03-14T11:30:00Jocelyn LaroucheManual testing497506497506---0.034--1.973%
2015-04-08T16:59:00Jocelyn LaroucheManual testing601981601981---0.041--2.137%
2015-05-01T17:20:00Jocelyn LaroucheManual testing728396728396---0.050--2.309%
2015-05-07T16:18:00Jocelyn LaroucheManual testing801235801235---0.055--2.397%
2015-05-22T00:28:00Jocelyn LaroucheManual testing881358881358---0.060--2.488%
2015-05-26T18:16:00Jocelyn LaroucheManual testing969493969493---0.066--2.580%
2015-06-08T13:43:00Jocelyn LaroucheManual testing10664421066442---0.073--2.674%
2015-06-25T21:15:00Jocelyn LaroucheManual testing11730861173086---0.080--2.770%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-24T17:20:00Architects Cubedm1_76l260261--0.089--
2010-10-27T20:37:00GrunwalderGIMPManual testing21263--0.926--
2015-05-03T22:58:00snme2pm1Manual testing263264--1.139--
2015-05-03T22:58:00snme2pm1Manual testing264265--2.167--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.121 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:15.121 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
20110008.1940.028%
25500000.74147.686%
302500000.04695.542%
3510000000.00299.791%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024314.47
500005000000100.595
50000500000010.060


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers04CDD9CC965160A10.081
2015-06-27T00:55:00MadPooManual testing04CDD9CC965160A10.081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:24:46alpertronManual testing
155158329476299977305143
1070CD9B77B60D__no
2017-10-19T04:54:39Oliver KruseThreadripper
155158329476299977305143
1070CD9B77B60D__no
2020-05-18T16:22:06CrypticCluecruncher
3406219192131009950281
155158329476299977305143
F32ADC3E688AF8__no
2020-05-19T19:12:07marssystemssystem11
3406219192131009950281
155158329476299977305143
F32ADC3E688AF8E3no


P-1 factor-bounds graph:
B1 = 1173086 (P-1 stage 1)
B1 = 1066442 (P-1 stage 1)
B1 = 969493 (P-1 stage 1)
B1 = 881358 (P-1 stage 1)
B1 = 801235 (P-1 stage 1)
B1 = 728396 (P-1 stage 1)
B1 = 601981 (P-1 stage 1)
B1 = 497506 (P-1 stage 1)
B1 = 452279 (P-1 stage 1)
B1 = 411163 (P-1 stage 1)
B1 = 373785 (P-1 stage 1)
B1 = 280831 (P-1 stage 1)
B1 = 187221 (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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TF factor-bounds graph:
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Last modified: 2020-05-19T19:12:07+00:00