is 2 1438207 - 1
has 432944 decimal digits
takes 0.055 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF73963D8EDEBFCE3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.660468.6567%2000000600000000.28577.2228%20.946170.9206%2.2639%
PrimeNet2560.006762.5000%65001100000.00072.7766%0.007363.5412%1.0412%
GPU722600.106865.0000%6000900000.00061.3547%0.107465.4742%0.4742%
Difference+7+20.5536+3.6567%+1994000+59910000+0.2851+5.8681%+20.8387+5.4464%+5.4464%

Known prime factors (1 factor, 77.1 bits, 0.00535966% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
14382071600583475149588054017372477.08355645100988577724
22 × 13 × 408389 × 2620291183
2015-04-25408389262029118338,3457.924914.762

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers15000243750---0.002--0.837%
2009-08-14T06:20:00markrlounge2000005000000---0.026--3.481%
2014-11-14T01:20:00Jocelyn LaroucheManual testing244628244628---0.014--1.385%
2015-01-27T21:58:00Jocelyn LaroucheManual testing325598325598---0.018--1.588%
2015-01-29T22:02:00Jocelyn LaroucheManual testing358157358157---0.020--1.660%
2015-02-13T17:59:00Jocelyn LaroucheManual testing393972393972---0.022--1.733%
2015-02-25T03:47:00Jocelyn LaroucheManual testing476705476705---0.026--1.885%
2015-03-03T20:46:00Jocelyn LaroucheManual testing524375524375---0.029--1.964%
2015-03-10T07:55:00Jocelyn LaroucheManual testing576812576812---0.032--2.044%
2015-04-08T16:58:00Jocelyn LaroucheManual testing767736767736---0.043--2.297%
unknown200000060000000---0.286--7.223%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00ANONYMOUSv4_computers21256--0.007--
2001-10-13T00:00:00ANONYMOUSv4_computers21257--0.013--
2003-07-21T00:00:00ANONYMOUSv4_computers21258--0.027--
2010-05-11T03:20:00Architects Cubedm1_fw260261--0.107--
2011-05-07T23:53:00GrunwalderGIMPManual testing21263--1.110--
2015-03-22T03:57:00snme2pm1Manual testing263264--1.365--
2015-03-22T03:57:00snme2pm1Manual testing264265--2.598--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.492 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.492 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.35725.749%
302500000.11389.315%
3510000000.00899.236%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025011.82
50000500000010.047
250000350000005013.63


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-01T00:00:00ANONYMOUSv4_computersF73963D8EDEBFCE30.055


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:24:22alpertronManual testing
160058347514958805401737
11254A7B654CF1__no
2017-10-18T06:53:50Oliver KruseGTX-2
160058347514958805401737
11254A7B654CF1__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 767736 (P-1 stage 1)
B1 = 576812 (P-1 stage 1)
B1 = 524375 (P-1 stage 1)
B1 = 476705 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 393972 (P-1 stage 1)
B1 = 358157 (P-1 stage 1)
B1 = 325598 (P-1 stage 1)
B1 = 244628 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 15000, B2 = 243750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
265
264
263
261
258
257
256
250
260
270
280
290
2100
Last modified: 2021-10-28T13:38:35+00:00