is 2 925987 - 1
has 278750 decimal digits
takes 0.022 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LC16AB6B49E1DC611double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26732.088970.1493 %100000005000000001.290310.5775 %33.379373.3067 %
Target2440.000054.5455 %1500030000000.006218.0421 %0.006262.7464 %
Difference+23+32.0889+15.6038 %+9985000+497000000+1.2841-7.4646 %+33.3730+10.5603 %

Known prime factors (1 factor, 72.1 bits, 0.00779076% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
92598752087720588960860648892272.1412812551395913812
22 × 7 × 17 × 47 × 125717477021
2014-03-11471257174770211,032.8240.84449.83

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-01-08ANONYMOUSv4_computers2000200000--0.00012.195%
2002-02-24ANONYMOUSv4_computers4096409600--0.00115.119%
2002-04-28ANONYMOUSv4_computers8192819200--0.00217.918%
2002-05-18ANONYMOUSv4_computers163841638400--0.00420.680%
2002-07-20ANONYMOUSv4_computers32768327680012--0.00723.397%
2002-12-25ANONYMOUSv4_computers65536655360012--0.01526.061%
2003-08-31ANONYMOUSv4_computers1310721310720012--0.02928.667%
2011-06-03JossManual testing200000200000--0.00715.584%
2011-07-13JossManual testing220232220232--0.00815.884%
2011-10-22JossManual testing734108734108--0.02619.632%
2013-10-13David Campeaui5-2500k9650002509000012--0.08031.790%
2013-12-22alpertronManual testing1000000050000000012--1.29041.325%
2016-03-17alpertronManual testing20000050000006---26.249%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-06-11ANONYMOUSv4_computers212550.005
2000-12-07ANONYMOUSv4_computers212560.010
2000-12-14ANONYMOUSv4_computers212560.010
2001-10-13ANONYMOUSv4_computers212570.021
2003-08-08ANONYMOUSv4_computers212580.041
2003-08-31ANONYMOUSv4_computers212580.041
2022-03-07LordJuliusManual testing258260
2010-05-25Architects Cubeda3_bu22602610.166


ECM factoring results:
Total ECM effort:13.990 GHz-days
Estimated T-Level:25.647
DigitsB1CompleteFacMiss
201100014.4620.000%
25500001.58820.440%
302500000.12987.855%
3510000000.00999.139%


ECM Summary

B1B2factorcurvesGHz-days
10.254
5000050000002727.536
25000025000000446.200


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-01-08ANONYMOUSv4_computersC16AB6B49E1DC6110.022


PRP results:
dateuseridcompidcofactorsres64
2017-09-28Oliver KruseGTX-3
5208772058896086064889
EA9EE682C7556B3B
2017-10-14Oliver KruseThreadripper-PC
5208772058896086064889
EA9EE682C7556B3B
2017-12-21ATHec2-1xh
5208772058896086064889
EA9EE682C7556B3B
2020-04-23Oliver KruseAddPrpType5
5208772058896086064889
8AF06ADF7BB74B1F


CERT results:
No CERT results for M925987


P-1 factor-bounds graph:
B1 = 10000000, B2 = 500000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 965000, B2 = 25090000 (P-1 stage 2)
B1 = 965000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 734108 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 220232 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 131072 (P-1 stage 1)
B1 = 16384, B2 = 1638400 (P-1 stage 2)
B1 = 65536 (P-1 stage 1)
B1 = 8192, B2 = 819200 (P-1 stage 2)
B1 = 32768 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 16384 (P-1 stage 1)
B1 = 2000, B2 = 200000 (P-1 stage 2)
B1 = 8192 (P-1 stage 1)
B1 = 4096 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
261
260
258
257
256
255
this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=25.65 ~= 69-bit
250
260
270
280
JSON version of this page
Last modified: 2024-03-03T02:29:32+00:00