is 2 4922251 - 1
has 1481746 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-L5F560736C3F054ABdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2676.036765.6716 %1200000397500000.66337.3581 %6.700068.1976 %
Target2651.482264.6154 %3200035000000.04442.3758 %1.526665.4561 %
Difference+2+4.5545+1.0563 %+1168000+36250000+0.6189+4.9823%+5.1734+2.7415 %

Known prime factors (1 factor, 70.0 bits, 0.00142130% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
492225111482645630383482177112269.960116640187897605
3 × 5 × 29 × 10837 × 24742859
2014-10-25108372474285929.8540.27300.5060

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-08-30Carsten Kossendeymother30000435000--0.0102.068%
2011-07-14Squeeky_SquirrelT7500_2200600009600006--0.0222.928%
2014-10-25mikrMSI1200000397500001222269.9600.6638.725%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-05-08ANONYMOUSv4_computers212610.031
2010-04-02markroldgamer2612620.062
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)
1998-06-01ANONYMOUSv4_computers5F560736C3F054AB0.682
2000-03-15ANONYMOUSv4_computers5F560736C3F054AB0.682


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
1148264563038348217711
31C55411C9F3F61F
2018-04-08ATHec2-PRPCFDC
1148264563038348217711
31C55411C9F3F61F


CERT results:
No CERT results for M4922251


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
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00