is 2 1744927 - 1
has 525276 decimal digits
takes 0.095 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7883C7FBA0F0B3F7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.028768.6567%2475400150000000.24845.7790%17.277170.4680%1.8113%
PrimeNet2570.011063.1579%80001400000.00122.8009%0.012264.1898%1.0319%
GPU722610.176065.5738%80001100000.00111.4118%0.177166.0598%0.4860%
Difference+6+16.8527+3.0829%+2467400+14890000+0.2473+4.3671%+17.1000+4.4082%+4.4082%

Known prime factors (1 factor, 90.6 bits, 0.00519112% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
174492718522412285933357872804586312890.581530750349038480058845
5 × 72 × 59 × 30389 × 992701 × 1217131
2015-04-189927011217131164,382,4710.07910.1589

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:42:00Carsten Kossendeyleela950001543750---0.014--2.401%
2014-04-05T13:21:00Jocelyn LaroucheManual testing100000100000---0.008--0.887%
2014-05-06T10:53:00Jocelyn LaroucheManual testing136783136783---0.011--1.059%
2014-09-15T22:12:00ANONYMOUSManual testing173566173566---0.014--1.203%
2015-04-18T13:28:00mikrMSI2475400150000002890.5810.1950.1890.3895.779%
2016-03-16T12:34:53alpertronManual testing5000001500000012---0.101--5.040%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-23T13:38:00Architects Cubedm1_fw260261--0.088--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.915--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.658 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:17.658 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110008.2900.025%
25500000.74947.271%
302500000.04695.491%
3510000000.00299.789%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025717.66


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers7883C7FBA0F0B3F70.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T05:25:33Oliver KruseGTX-1
1852241228593335787280458631
56C0D388B35AAD__no
2017-11-03T16:20:39srow7sys2b
1852241228593335787280458631
56C0D388B35AAD__no


P-1 factor-bounds graph:
B1 = 2475400, B2 = 15000000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 95000, B2 = 1543750 (P-1 stage 2)
B1 = 173566 (P-1 stage 1)
B1 = 136783 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
267
263
261
258
257
250
260
270
280
290
2100
Last modified: 2020-08-21T10:54:48+00:00