is 2 4918601 - 1
has 1480647 decimal digits
takes 0.682 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LA31D3D396FF3E4B5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2676.041165.6716 %1200000397500000.66337.3575 %6.704468.1974 %
Target2651.483364.6154 %3200035000000.04442.3755 %1.527765.4560 %
Difference+2+4.5578+1.0563 %+1168000+36250000+0.6189+4.9820%+5.1768+2.7414 %

Known prime factors (1 factor, 72.7 bits, 0.00147801% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
491860176587756171546504896712272.698778552236413835
3 × 5 × 13 × 19 × 55057 × 3816691
2014-10-12550573816691306.190.05230.0781

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-09-18Carsten Kossendeymother30000435000--0.0102.067%
2011-07-13Squeeky_SquirrelT7500_2200600009600006--0.0222.927%
2014-10-12mikrMSI1200000397500001222272.6980.6638.724%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-05-08ANONYMOUSv4_computers212610.031
2010-03-31Squeeky_SquirrelP4_26002612620.062
2011-09-11GrunwalderGIMPManual testing212630.324


ECM factoring results:
Total ECM effort:1.025 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.025


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-14ANONYMOUSv4_computersA31D3D396FF3E4B50.682
2000-04-05cbwoodv4_computersA31D3D396FF3E4B50.682


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
7658775617154650489671
1B4060ED2F86462B
2018-04-08ATHec2-PRPCFDC
7658775617154650489671
1B4060ED2F86462B


CERT results:
No CERT results for M4918601


P-1 factor-bounds graph:
B1 = 1200000, B2 = 39750000 (P-1 stage 2)
B1 = 1200000 (P-1 stage 1)
B1 = 60000, B2 = 960000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 30000, B2 = 435000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
263
262
261
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=1.15 ~= -13-bit
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00