is 2 52761881 - 1
has 15882909 decimal digits
takes 101.078 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27218.125563.8889%520000107900002.99884.4294%21.124265.4884%
Target27336.254364.3836%3600009600000015.47453.9094%51.728865.7759%
Difference-1-18.1288-0.4947%+160000-85210000-12.4757+0.5201%-30.6046-0.2875%

Known prime factors (1 factor, 68.8 bits, 0.00013041% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
527618815159789659754859006892168.8064889694569224
23 × 103 × 5934095351		2015-01-2210359340953512.1313898.091,677.4

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-03-13hustensaftW7hm52000010790000---2.999--4.429%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-12-01ANONYMOUSv4_computers21253--2.27422e-5--
2000-01-04ANONYMOUSv4_computers21253--2.27422e-5--
2000-02-23ANONYMOUSv4_computers21254--4.54845e-5--
2000-05-10ANONYMOUSv4_computers21256--0.000--
2001-07-07ANONYMOUSv4_computers21257--0.000--
2002-05-25ANONYMOUSv4_computers21258--0.001--
2003-12-131997rj7v4_computers21259--0.001--
2004-03-261997rj7v4_computers21260--0.003--
2008-05-10ANONYMOUSv4_computers21263--0.030--
2008-11-17DerekManual testing21264--0.067--
2009-02-13arnaudSRV-330264265--0.071--
2009-02-14arnaudSRV-330265266--0.142--
2009-02-15arnaudSRV-330266267--0.283--
2009-06-28curtiscwde2610-31l267268--0.567--
2010-03-28sannerud.comJimEmcLap268269--1.133--
2015-01-22Mark RoseManual testing268269*68.806211.002238.92.367
2011-12-08Kyle AskineManual testing269270--2.266--
2012-02-22James HeinrichManual testing270272--13.60--


ECM factoring results:
No ECM results for M52761881


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2013-05-27curtiscjckl-cci09lA9A9156E65C3C7__101.1


PRP results:
No PRP results for M52761881


P-1 factor-bounds graph:
B1 = 520000, B2 = 10790000 (P-1 stage 2)
B1 = 520000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
272
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269
268
267
266
265
264
263
260
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258
257
256
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253
this exponent TF target: 73
TF double-checked to: 67.8
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280
Last modified: 2023-06-05T21:50:05+00:00