is 2 1748009 - 1
has 526204 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-L07DBA9A7110C2DF2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.998768.6567%500000150000000.10155.0406%17.100270.2366%1.5799%
PrimeNet2570.011063.1579%80001400000.00122.8019%0.012264.1902%1.0323%
GPU722610.175765.5738%80001100000.00111.4123%0.176866.0600%0.4862%
Difference+6+16.8230+3.0829%+492000+14890000+0.1004+3.6283%+16.9234+4.1766%+4.1766%

Known prime factors (2 factors, 152.5 bits, 0.00872554% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
174800962879422954146200769132272.4131798601235867384
23 × 3 × 13 × 37 × 139 × 467 × 2400197
2008-07-224672400197613.900.01030.0192
174800913048772433764449542413592580.110373246717658903631
32 × 107 × 139 × 2788398945583
2020-03-051392788398945583212,58111,95022,320

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1748009820499280895078513752434592111896803414564476746152.523
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:35:14alpertronManual testing5000001500000012-
skipped known factor: 6287942295414620076913
--0.101--5.041%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.249 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.249 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110009.6540.006%
25500000.89340.933%
302500000.05694.522%
3510000000.00399.737%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024817.04
50000500000030.206


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers07DBA9A7110C2DF20.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T05:45:52Oliver KruseGTX-0
6287942295414620076913
489FD0DFA61D26__no
2017-11-03T18:33:02ATHec2-1xf
6287942295414620076913
489FD0DFA61D26__no
2020-03-06T02:52:56Niels_Mache_NextcloudSuperDry-X
6287942295414620076913
1304877243376444954241359
4D69020D6AC25991no
2020-03-06T08:30:16Jinyuan WangManual testing
6287942295414620076913
1304877243376444954241359
4D69020D6AC25991no
2020-03-06T23:00:12marssystemssystem11
6287942295414620076913
1304877243376444954241359
4D69020D6AC25991no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2020-07-06T08:23:40+00:00