is 2 1952479 - 1
has 587755 decimal digits
takes 0.106 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L216AA732D5B1C40Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.218668.6567%500000150000000.10155.1083%15.320070.2578%1.6011%
PrimeNet2580.019763.7931%80001400000.00122.4674%0.020964.6865%0.8934%
GPU722620.314766.1290%8000900000.00101.1534%0.315666.5197%0.3907%
Difference+5+14.9039+2.5277%+492000+14910000+0.1005+3.9548%+15.0044+3.7381%+3.7381%

Known prime factors (1 factor, 65.7 bits, 0.00336574% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1952479605793046091651035132065.71515513433078964
22 × 3878358269741
2009-08-14438783582697416.904516,62231,045

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:14alpertronManual testing5000001500000012---0.101--5.108%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-02-01T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-02-19T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-03-23T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-03-31T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-04-05T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--


ECM factoring results:

Old Calculation Method

Total ECM effort:21.482 GHz-days
Estimated T-Level:24.696
DigitsB1CurvesCompleteFacMiss
2011000263 / 1002.6307.113%
2550000263 / 2800.93939.025%

New Calculation Method

Total ECM effort:21.482 GHz-days
Estimated T-Level:24.696
DigitsB1CompleteFacMiss
201100010.8560.002%
25500001.02635.857%
302500000.06593.670%
3510000000.00399.693%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000322.227
50000671376570.554
50000690000070.562
50000750000021718.14


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-01T00:00:00ANONYMOUSv4_computers216AA732D5B1C40C0.106
1998-02-19T00:00:00ANONYMOUSv4_computers216AA732D5B1C40C0.106
1998-03-23T00:00:00ANONYMOUSv4_computers216AA732D5B1C40C0.106
1998-03-31T00:00:00ANONYMOUSv4_computers216AA732D5B1C40C0.106
1998-04-05T00:00:00ANONYMOUSv4_computers216AA732D5B1C40C0.106
1999-05-02T00:00:00ANONYMOUSv4_computers216AA732D5B1C40C0.106


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T06:00:02Oliver KruseGTX-3
60579304609165103513
E1FEE0703E9DCE__no
2017-11-11T11:51:47ATHec2-1xf
60579304609165103513
E1FEE0703E9DCE__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
1013
TF factor-bounds graph:
267
258
257
250
260
270
280
290
2100
Last modified: 2022-06-08T12:37:08+00:00