is 2 614981 - 1
has 185128 decimal digits
takes 0.009 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L240ABD3BECE961C0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26748.316870.1493%1270000406400000.07525.9221%48.392071.9171%1.7678%
PrimeNet2400.000050.0000%60002200000.000420.5737%0.000460.2869%10.2869%
GPU722440.000054.5455%100003600000.000615.4736%0.000661.5789%7.0334%
Difference+23+48.3168+15.6038%+1260000+40280000+0.0746-9.5514%+48.3914+10.3382%+10.3382%

Known prime factors (1 factor, 79.0 bits, 0.01283905% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6149815869984381758388400714472478.958477249246867658383
32 × 40283 × 1316378971189
2015-02-21402831316378971189143,5611,580.12,951.2

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-01-02T00:00:00ANONYMOUSv4_computers2000200000---0.000--0.188%
2002-01-22T00:00:00ANONYMOUSv4_computers4096409600---0.001--0.406%
2002-03-10T00:00:00ANONYMOUSv4_computers8192819200---0.001--0.739%
2002-05-05T00:00:00ANONYMOUSv4_computers163841638400---0.002--1.209%
2002-06-29T00:00:00ANONYMOUSv4_computers327683276800---0.005--1.823%
2002-09-29T00:00:00ANONYMOUSv4_computers655366553600---0.009--2.578%
2003-05-11T00:00:00ANONYMOUSv4_computers13107213107200---0.018--3.460%
2011-07-10T12:42:00Jocelyn LaroucheManual testing374406374406---0.008--1.482%
2011-08-31T00:06:00Jocelyn LaroucheManual testing624010624010---0.014--1.864%
2012-03-10T12:51:00Jocelyn LaroucheManual testing780013780013---0.017--2.047%
2012-08-01T01:15:00Jocelyn LaroucheManual testing12299621229962---0.027--2.450%
2013-10-19T12:34:00David Campeaui5-2500k127000040640000---0.075--5.922%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-04-15T00:00:00ANONYMOUSv4_computers21256--0.016--
2001-10-20T00:00:00ANONYMOUSv4_computers21257--0.031--
2003-11-08T00:00:00ANONYMOUSv4_computers21258--0.062--
2008-10-13T00:04:00Sturle Sundeantonov.ifi258259--0.062--
2008-10-13T00:42:00Sturle Sundeantonov.ifi259260--0.125--
2011-01-25T06:03:00Sid & AndyToy_Soldier_2260261--0.250--


ECM factoring results:

Old Calculation Method

Total ECM effort:8.521 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000326 / 1003.2603.776%
2550000326 / 2801.16431.150%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:8.521 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100012.7630.000%
25500001.35225.865%
302500000.10889.777%
3510000000.00799.295%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002804.753
50000500000020.034
25000025000000443.734


Lucas-Lehmer results:
No L-L results for M614981


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-27T12:42:09Oliver KruseGTX-0
586998438175838840071447
76FFDDF6496D68__no
2017-10-13T12:43:56Oliver KruseGTX-376FFDDF6496D68__no
2017-12-15T17:04:08ATHec2-1xf
586998438175838840071447
76FFDDF6496D68__no
2020-04-19T15:45:39Oliver KruseAddPrpType5
586998438175838840071447
728E0F8DF080E5__no


P-1 factor-bounds graph:
B1 = 1270000, B2 = 40640000 (P-1 stage 2)
B1 = 1270000 (P-1 stage 1)
B1 = 1229962 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 780013 (P-1 stage 1)
B1 = 624010 (P-1 stage 1)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 374406 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 16384, B2 = 1638400 (P-1 stage 2)
B1 = 65536 (P-1 stage 1)
B1 = 8192, B2 = 819200 (P-1 stage 2)
B1 = 32768 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 16384 (P-1 stage 1)
B1 = 2000, B2 = 200000 (P-1 stage 2)
B1 = 8192 (P-1 stage 1)
B1 = 4096 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
102
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102
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104
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1010
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TF factor-bounds graph:
267
261
260
259
258
257
256
250
260
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2100
Last modified: 2020-04-19T15:45:39+00:00