is 2 1872097 - 1
has 563558 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-LEB6D1DEBAAE0E11Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.872068.6567%500000150000000.10155.0825%15.973570.2497%1.5930%
PrimeNet2570.010363.1579%90001600000.00143.0297%0.011664.2741%1.1162%
GPU722610.164165.5738%100001500000.00141.6900%0.165566.1556%0.5818%
Difference+6+15.7079+3.0829%+490000+14850000+0.1001+3.3925%+15.8080+4.0942%+4.0942%

Known prime factors (1 factor, 69.5 bits, 0.00371400% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18720978522009162936779335372169.530227605972418544
24 × 3 × 29 × 163510037657
2009-07-222916351003765786.498700.761,308.8

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:38:16alpertronManual testing5000001500000012---0.101--5.082%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.189 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:19.189 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
201100010.2950.003%
25500000.94738.771%
302500000.06094.165%
3510000000.00399.718%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000382.631
50000660000021216.56


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computersEB6D1DEBAAE0E11C0.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T11:34:45Oliver KruseGTX-0
852200916293677933537
139739BB56584C__no
2017-11-07T16:08:29kkmrkkblmbrbkc4.xlarge
852200916293677933537
139739BB56584C__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2021-09-10T07:34:27+00:00