is 2 1946621 - 1
has 585992 decimal digits
takes 0.106 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
Actual26715.264468.6567%500000150000000.10155.1064%15.365870.2572%1.6005%
PrimeNet2580.019763.7931%80001400000.00122.4659%0.020964.6859%0.8928%
GPU722620.315666.1290%8000900000.00101.1527%0.316666.5195%0.3904%
Difference+5+14.9488+2.5277%+492000+14910000+0.1005+3.9537%+15.0492+3.7378%+3.7378%

Known prime factors (3 factors, 130.4 bits, 0.00670102% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
194662111679727823.4783
3
-135.745e-138.723e-81.601e-7
1946621225340846971134.3915788
22 × 1447
2008-07-15414471.473e-96.499e-61.156e-5
194662170330870854450808710972272.5751806485978894988
22 × 3 × 5223899 × 28817651
2018-05-11522389928817651541.050.51200.8363

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
19466212631919574558377191857.869
1946621821445371252242180673351505192996.052
194662115848418006479632829131433730260933106.966
1946621185105195697566342504492793088038950774340130.444
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:10alpertronManual testing5000001500000012-
skipped known factor: 11679727
skipped known factor: 22534084697
--0.101--5.106%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:48:00J FeitsmaManual testing??34.391112.97237e-100.2346.58796e-10


ECM factoring results:

Old Calculation Method

Total ECM effort:20.421 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:20.421 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
201100010.3130.003%
25500000.97537.719%
302500000.06293.973%
3510000000.00399.708%


ECM Summary

B1B2factorcurvesGHz-days
500005000000221.530
50000500000030.209
500005990784141.052
50000750000021117.63


Lucas-Lehmer results:
No L-L results for M1946621


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T04:36:44Oliver KruseGTX-1
11679727
22534084697
9D48B4917C59AA__no
2017-11-11T09:19:38kkmrkkblmbrbkc4.xlarge
11679727
22534084697
9D48B4917C59AA__no
2018-05-15T11:17:15Oliver KruseGTX-7
11679727
22534084697
7033087085445080871097
6215DEB18FE52A__no
2018-05-15T11:59:52ATHec2-PRPCFDC
11679727
22534084697
7033087085445080871097
6215DEB18FE52A__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
2
220
230
240
250
260
270
280
290
2100
Last modified: 2022-04-14T10:51:23+00:00