is 2 47877119 - 1
has 14412449 decimal digits
takes 83.120 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LEAA03149C85611C6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27479.910164.8649 %100000010000002.51741.9295 %82.427565.5428 %
Target27219.974863.8889 %340000550000008.35274.1639 %28.327465.3925 %
Difference+2+59.9354+0.9760 %+660000-54000000-5.8353-2.2343 %+54.1000+0.1503 %

Known prime factors (1 factor, 78.2 bits, 0.00016324% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
478771193367489314466816275063292478.1563516804461925556
22 × 157 × 2377 × 2791 × 844111
2020-10-1127918441112,395.60.12240.2162

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-10-18curtiscwde3100-05l745000745000--1.8752.141%
2020-10-11Sid & AndyRocky1000000100000012478.1562.5172.401%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-05-10tmorrowv4_computers212691.249
2015-08-09Gordon SpenceManual testing2692702.497
2015-09-18Mark RoseManual testing2702714.995
2015-11-19Judge HaleManual testing2712729.99
2018-01-07Mark RoseManual testing27227319.98
2019-07-21Sid & AndyManual testing27327439.96


ECM factoring results:
No ECM results for M47877119


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2009-11-23curtiscwde3100-05lEAA03149C85611C683.12
2019-07-29HaltingProblemwork-lappyEAA03149C85611C683.12


PRP results:
No PRP results for M47877119


CERT results:
No CERT results for M47877119


P-1 factor-bounds graph:
B1 = 1000000 (P-1 stage 1)
B1 = 745000 (P-1 stage 1)
102
103
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105
106
102
103
104
105
106
TF factor-bounds graph:
274
273
272
271
270
269
this exponent TF target: 72
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00