is 2 15724783 - 1
has 4733632 decimal digits
takes 8.598 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF2392218E121187Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671.889664.1791%19500045825000.34414.6874%2.233865.8582%1.6791%
PrimeNet2650.464063.0769%7000022000000.14754.3077%0.611564.6674%1.5905%
GPU722697.592365.2174%11000028000000.20343.1172%7.795766.3016%1.0842%
Difference-2-5.7026-1.0383%+85000+1782500+0.1407+1.5702%-5.5619-0.4435%-0.4435%

Known prime factors (1 factor, 67.9 bits, 0.00043165% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
157247832709380401826411752632167.8778615000925057
3 × 31 × 92634418549
2016-12-2831926344185493.69054,001.67,473.9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-08-10T00:00:00ANONYMOUSv4_computers1950004582500---0.344--4.687%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-01-28T00:00:00Net_Forcev4_computers21258--0.002--
2001-04-01T00:00:00ANONYMOUSv4_computers21264--0.226--
2001-04-01T00:00:00xtreme2kv4_computers21265--0.464--
2016-03-16T02:29:03Mark RoseManual testing265266--0.475--
2014-07-10T09:28:00NesowaManual testing266267--0.950--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.831 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.831 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.831


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-08-31T00:00:00ANONYMOUSv4_computersF2392218E121187E8.598
2006-05-29T00:00:00ANONYMOUSv4_computersF2392218E121187E8.598


PRP results:
No PRP results for M15724783


P-1 factor-bounds graph:
B1 = 195000, B2 = 4582500 (P-1 stage 2)
B1 = 195000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2016-12-28T19:41:35+00:00