is 2 28619 - 1
has 8616 decimal digits
takes 0.000 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actualunknown500000000100000000000.812850.1646%0.812850.1646%50.1646%
PrimeNet2400.000062.5000%500100000.00004.0544%0.000064.0204%1.5204%
GPU722440.000165.9091%500100000.00001.7344%0.000166.5004%0.5913%
Difference-44-0.0001-65.9091%+499999500+9999990000+0.8128+48.4302%+0.8127-16.3358%-16.3358%

Known prime factors (2 factors, 143.7 bits, 0.50220136% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2861911010301691030.03619236
22 × 3 × 7 × 229
-72295.816e-91.525e-81.827e-8
286191673937860329084564007491714481379135113.689292452192656816199728762660205
3 × 5 × 1559454730591 × 12502326910380317
2018-01-191559454730591125023269103803175.294e+12545,2271,016,132

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
286191843056085253630373124459919661532577826067944143.725
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-12-28T07:28:38kkmrkkblmbrbkManual testing5000000001000000000012-
skipped known factor: 1101030169
--0.813--42.840%


Trial Factoring results:
No TF results for M28619


ECM factoring results:

Old Calculation Method

Total ECM effort:19.207 GHz-days
Estimated T-Level:31.617
DigitsB1CurvesCompleteFacMiss
20110001283 / 10012.8300.000%
25500001283 / 2804.5821.015%
302500001119 / 6401.74817.381%
351000000511 / 15800.32372.360%
403000000500 / 47000.10689.907%

New Calculation Method

Total ECM effort:19.207 GHz-days
Estimated T-Level:31.617
DigitsB1CompleteFacMiss
2011000157.5280.000%
255000031.9270.000%
302500005.4990.409%
3510000000.79745.081%
4030000000.09890.623%
45110000000.01198.945%
50440000000.00199.899%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001640.094
250000250000006081.747
1000000100000000110.126
3000000300000000230.793
300000030000000047716.45


Lucas-Lehmer results:
No L-L results for M28619


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-21T19:38:30Oliver KrusePRP
1101030169
60C73FA4E97875__no
2017-09-21T20:27:18Oliver KruseManual testing
1101030169
60C73FA4E97875__no
2017-10-12T16:30:08kkmrkkblmbrbkManual testing
1101030169
60C73FA4E97875__no
2018-01-19T18:05:54ATHec2-1xd
1101030169
16739378603290845640074917144813791
59762FD08ED84E__no
2018-01-19T22:41:20Squeeky_Squirreli5-5250U_1600
1101030169
16739378603290845640074917144813791
0925996A3DE3FE__no
2018-01-19T22:45:54Squeeky_Squirreli5-5250U_1600
1101030169
60C73FA4E97875__no
2018-01-20T13:17:39Squeeky_Squirreli5-5250U_1600
1101030169
16739378603290845640074917144813791
59762FD08ED84E__no
2018-01-22T03:56:57Oliver KruseGTX-4
1101030169
16739378603290845640074917144813791
59762FD08ED84E__no
2018-02-28T19:54:12kkmrkkblmbrbkc5.xlarge
1101030169
16739378603290845640074917144813791
0925996A3DE3FE__no


P-1 factor-bounds graph:
B1 = 500000000, B2 = 10000000000 (P-1 stage 2)
B1 = 500000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-02-28T19:54:12+00:00