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
factored, 0 LL tests remaining
ResidueStatus
L-LA9A9156E65C3C712double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27218.125563.8889 %520000107900002.99884.4294 %21.124265.4884 %
Target27336.254364.3836 %3600006000000010.02613.9094 %46.280465.7759 %
Difference-1-18.1288-0.4947 %+160000-49210000-7.0274+0.5201%-25.1562-0.2875 %

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:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-03-13hustensaftW7hm520000107900006--2.9994.018%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-12-01ANONYMOUSv4_computers212532.27000e-5
2000-02-23ANONYMOUSv4_computers212544.55000e-5
2000-05-10ANONYMOUSv4_computers212560.000
2001-07-07ANONYMOUSv4_computers212570.000
2002-05-25ANONYMOUSv4_computers212580.001
2003-12-131997rj7v4_computers212590.001
2004-03-261997rj7v4_computers212600.001
2008-05-10ANONYMOUSv4_computers212630.019
2008-11-17DerekManual testing212640.036
2009-02-13arnaudSRV-3302642650.071
2009-02-14arnaudSRV-3302652660.142
2009-02-15arnaudSRV-3302662670.283
2009-06-28curtiscwde2610-31l2672680.567
2010-03-28sannerud.comJimEmcLap2682691.133
2015-01-22Mark RoseManual testing268269*
68.806
21
0.913
2011-12-08Kyle AskineManual testing2692702.266
2012-02-22James HeinrichManual testing27027213.60


ECM factoring results:
No ECM results for M52761881


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2013-05-27curtiscjckl-cci09lA9A9156E65C3C712101.1


PRP results:
No PRP results for M52761881


CERT results:
No CERT 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
270
269
268
267
266
265
264
263
260
259
258
257
256
254
253
this exponent TF target: 73
TF double-checked to: 67
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280
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Last modified: 2024-03-13T02:15:48+00:00