is 2 1714787 - 1
has 516203 decimal digits
takes 0.081 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L50D4E6CBC43E982Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.328168.6567%500000150000000.08805.0290%17.416170.2330%1.5763%
PrimeNet2570.011263.1579%80001400000.00102.7917%0.012264.1864%1.0285%
GPU722610.179165.5738%70001100000.00091.3428%0.180066.0360%0.4623%
Difference+6+17.1489+3.0829%+493000+14890000+0.0872+3.6862%+17.2361+4.1969%+4.1969%

Known prime factors (3 factors, 218.7 bits, 0.01275422% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
171478730510357490032879875532271.370889625285532048
24 × 3 × 13 × 172 × 937 × 5264839
2014-10-179375264839556.970.01960.0366
1714787105144853602972422116632373.1553065828397432813
33 × 1499 × 75749966581
2020-04-061499757499665811,732.0281.63526.01
1714787214455309066117420460732374.1836253117998507028
22 × 11 × 142116318147887
2020-04-06111421163181478873,548.6528,380986,866

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
17147873208007071663860275088649579335917413543063944144.525
17147876543108145242731808442354427692813477652936944145.553
171478722548872076137120598449949970669998736394939945147.338
171478768797414803996345182515599468624630973122824688522
2773904833830647
66218.708
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-29T18:46:00Jocelyn LaroucheManual testing5000050000---0.003--0.572%
2011-02-07T12:41:00Carsten Kossendeyleela900001507500---0.011--2.355%
2014-04-01T22:35:00Jocelyn LaroucheManual testing100000100000---0.007--0.884%
2014-05-03T00:50:00Jocelyn LaroucheManual testing150000150000---0.010--1.110%
2014-10-05T22:25:00Jocelyn LaroucheManual testing187430187430---0.013--1.248%
2016-03-16T12:30:33alpertronManual testing5000001500000012-
skipped known factor: 3051035749003287987553
--0.088--5.029%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-24T12:42:00Architects Cubeda3_bu2260261--0.090--
2010-10-16T22:16:00GrunwalderGIMPManual testing21263--0.931--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.112 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:15.112 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
20110008.1940.028%
25500000.74147.686%
302500000.04695.542%
3510000000.00299.791%


ECM Summary

B1B2factorcurvesGHz-days
50000500000019911.84
50000500000010.059
500005000000372.201
500005000000171.011


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-06-06T00:00:00ANONYMOUSv4_computers50D4E6CBC43E982E0.081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T03:45:21Oliver KruseGTX-0
3051035749003287987553
9BFBBAD6614CFD__no
2017-11-03T15:12:02kkmrkkblmbrbkc4.xlarge
3051035749003287987553
9BFBBAD6614CFD__no
2020-04-07T13:13:27mnd9mnd
3051035749003287987553
10514485360297242211663
21445530906611742046073
F53D623B04F0357Eno
2020-04-08T07:55:59Sébastien Broucke130302
3051035749003287987553
10514485360297242211663
21445530906611742046073
F53D623B04F0357Eno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 187430 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 150000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-04-20T10:38:37+00:00