is 2 1872553 - 1
has 563695 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LFAA703E379F82395double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.868168.6567%500000150000000.10155.0826%15.969670.2498%1.5931%
PrimeNet2570.010363.1579%90001600000.00143.0299%0.011664.2742%1.1163%
GPU722610.164065.5738%100001500000.00141.6901%0.165466.1556%0.5818%
Difference+6+15.7041+3.0829%+490000+14850000+0.1001+3.3925%+15.8042+4.0942%+4.0942%

Known prime factors (1 factor, 66.0 bits, 0.00352595% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1872553750896539912690275292066.02520050074414788
22 × 11 × 29 × 87553 × 179471
2012-01-108755317947115.2600.00730.0140

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-10T17:01:00markrtiny500000150000002066.0250.0390.2030.0795.083%
2016-03-16T12:38:21alpertronManual testing5000001500000012-
skipped known factor: 75089653991269027529
--0.101--5.083%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-11T14:32:00Architects CubedManual testing260261--0.082--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.852--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.889 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.889 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
201100010.6540.002%
25500000.98037.515%
302500000.06293.967%
3510000000.00399.708%


ECM Summary

B1B2factorcurvesGHz-days
500005000000302.077
50000660000022117.26
50000670000070.551


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computersFAA703E379F823950.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T11:46:50Oliver KruseGTX-2
75089653991269027529
41F4E83E99EAF1__no
2017-11-07T16:32:45kkmrkkblmbrbkc4.xlarge
75089653991269027529
41F4E83E99EAF1__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2021-09-10T07:34:27+00:00