is 2 1749887 - 1
has 526769 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-L2A788FBAF71F9FA9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.980568.6567%500000150000000.10155.0413%17.082070.2368%1.5801%
PrimeNet2570.011063.1579%80001400000.00122.8024%0.012264.1904%1.0325%
GPU722610.175565.5738%80001100000.00111.4126%0.176666.0601%0.4863%
Difference+6+16.8049+3.0829%+492000+14890000+0.1004+3.6287%+16.9053+4.1767%+4.1767%

Known prime factors (1 factor, 66.2 bits, 0.00378202% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1749887836573436170968954972066.18123903641668604
22 × 5233 × 1141966447
2014-12-23523311419664479.44534.89469.1410

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:45:00Carsten Kossendeyleela950001543750---0.014--2.402%
2014-04-08T23:00:00Jocelyn LaroucheManual testing100000100000---0.008--0.887%
2014-05-06T10:53:00Jocelyn LaroucheManual testing136679136679---0.011--1.059%
2014-09-15T22:12:00ANONYMOUSManual testing173358173358---0.014--1.202%
2016-03-16T12:35:33alpertronManual testing5000001500000012---0.101--5.041%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-24T12:42:00Architects Cubedm1_fw260261--0.088--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.912--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.663 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:17.663 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110008.2900.025%
25500000.74947.271%
302500000.04695.491%
3510000000.00299.789%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025517.53
50000500000020.137


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers2A788FBAF71F9FA90.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T06:26:22Oliver KruseGTX-1
83657343617096895497
2935353F6BF1BA__no
2017-11-03T19:38:51ATHec2-1xf
83657343617096895497
2935353F6BF1BA__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 95000, B2 = 1543750 (P-1 stage 2)
B1 = 173358 (P-1 stage 1)
B1 = 136679 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2020-08-14T09:31:12+00:00