is 2 619981 - 1
has 186633 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-LF600BEA7EEED689Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26747.927170.1493%1275000408000000.07555.9338%48.002771.9205%1.7713%
PrimeNet2400.000050.0000%60002200000.000420.5924%0.000460.2962%10.2962%
GPU722440.000054.5455%100003600000.000615.4885%0.000661.5857%7.0402%
Difference+23+47.9271+15.6038%+1265000+40440000+0.0749-9.5547%+48.0020+10.3349%+10.3349%

Known prime factors (1 factor, 81.7 bits, 0.01317986% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
61998139623270810629028367460092581.7133195522992690826684
22 × 3 × 23 × 11577981857575459
2013-12-0323115779818575754591,481,35013,897,75925,957,144

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-12-31T00:00:00Alex Kruppav4_computers200040000---8.96776e-5--0.110%
2001-01-14T00:00:00Alex Kruppav4_computers1000004000000---0.007--2.580%
2002-05-11T00:00:00ANONYMOUSv4_computers163841638400---0.002--1.211%
2002-06-29T00:00:00ANONYMOUSv4_computers327683276800---0.005--1.826%
2002-09-29T00:00:00ANONYMOUSv4_computers655366553600---0.009--2.581%
2003-05-19T00:00:00ANONYMOUSv4_computers13107213107200---0.018--3.464%
2011-07-10T12:43:00Jocelyn LaroucheManual testing370495370495---0.008--1.476%
2011-08-31T00:06:00Jocelyn LaroucheManual testing617493617493---0.014--1.858%
2012-06-19T02:41:00Jocelyn LaroucheManual testing619987619987---0.014--1.861%
2012-08-01T01:16:00Jocelyn LaroucheManual testing12399621239962---0.027--2.460%
2013-10-20T06:01:00David Campeaui5-2500k127500040800000---0.076--5.934%
2016-03-17T18:49:07alpertronManual testing10000003000000012---0.057--5.481%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-04-15T00:00:00ANONYMOUSv4_computers21256--0.015--
2001-10-20T00:00:00ANONYMOUSv4_computers21257--0.031--
2003-10-14T00:00:00ANONYMOUSv4_computers21258--0.062--
2008-10-14T02:48:00Sturle Sundeagrell.ifi258259--0.062--
2008-10-14T03:32:00Sturle Sundeagrell.ifi259260--0.124--
2010-12-29T02:24:00Sid & AndyToy_Soldier260261--0.248--


ECM factoring results:

Old Calculation Method

Total ECM effort:8.475 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000323 / 1003.2303.892%
2550000323 / 2801.15431.486%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:8.475 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100012.6670.000%
25500001.34426.092%
302500000.10789.825%
3510000000.00799.297%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002794.739
25000025000000443.737


Lucas-Lehmer results:
No L-L results for M619981


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-27T12:51:50Oliver KruseGTX-1
3962327081062902836746009
83138A875B8F21__no
2017-09-28T09:44:08Oliver KruseManual testing
3962327081062902836746009
83138A875B8F21__no
2017-11-08T16:19:08kkmrkkblmbrbkc4.large
3962327081062902836746009
83138A875B8F21__no
2020-04-19T16:18:58Oliver KruseAddPrpType5
3962327081062902836746009
5231C917A027B3__no


P-1 factor-bounds graph:
B1 = 1275000, B2 = 40800000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1275000 (P-1 stage 1)
B1 = 1239962 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 619987 (P-1 stage 1)
B1 = 617493 (P-1 stage 1)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 370495 (P-1 stage 1)
B1 = 100000, B2 = 4000000 (P-1 stage 2)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 16384, B2 = 1638400 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
B1 = 16384 (P-1 stage 1)
B1 = 2000, B2 = 40000 (P-1 stage 2)
B1 = 2000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-04-19T16:18:58+00:00