is 2 1799621 - 1
has 541740 decimal digits
takes 0.098 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1EBD098081B4751Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.511268.6567%247540024754000.19473.6022%16.705969.7858%1.1290%
PrimeNet2570.010763.1579%80001500000.00122.8700%0.011964.2153%1.0574%
GPU722610.170765.5738%90001300000.00121.5543%0.171966.1089%0.5351%
Difference+6+16.3405+3.0829%+2466400+2345400+0.1935+2.0479%+16.5340+3.6769%+3.6769%

Known prime factors (1 factor, 86.4 bits, 0.00480344% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17996211052345333846939383047085912786.44429237971046318624395
5 × 13 × 149 × 11981 × 109049 × 2310643
2015-06-18109049231064315,597,4910.01800.0185

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-11T06:18:00Carsten Kossendeyleela1000001650000---0.015--2.476%
2014-05-09T20:32:00Jocelyn LaroucheManual testing135665135665---0.011--1.060%
2014-09-19T20:39:00Jocelyn LaroucheManual testing171330171330---0.013--1.201%
2015-06-18T15:07:00mikrMSI247540024754002786.4440.1950.1950.3893.602%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-20T13:13:00Architects Cubeda3_bu2260261--0.085--
2010-12-13T03:33:00GrunwalderGIMPManual testing21263--0.887--
2015-05-15T10:56:00snme2pm1Manual testing263264--1.091--
2015-05-15T10:56:00snme2pm1Manual testing264265--2.076--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.787 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:17.787 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.3230.024%
25500000.75247.133%
302500000.04695.474%
3510000000.00299.788%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025817.79


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-23T00:00:00MadPoov4_computers1EBD098081B4751D0.098
1999-09-07T00:00:00ANONYMOUSv4_computers1EBD098081B4751D0.098


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T18:35:35Oliver KruseGTX-2
105234533384693938304708591
817EBF51E75DA7__no
2017-11-05T10:37:51kkmrkkblmbrbkc4.xlarge
105234533384693938304708591
817EBF51E75DA7__no


P-1 factor-bounds graph:
B1 = 2475400 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 171330 (P-1 stage 1)
B1 = 135665 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
104
105
106
107
104
105
106
107
TF factor-bounds graph:
267
265
264
263
261
258
250
260
270
280
290
2100
Last modified: 2020-12-25T11:15:45+00:00