is 2 523907 - 1
has 157712 decimal digits
takes 0.008 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L6DE98918150BC79Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual268113.770072.0588%7000000033780268021503,893.167922.8636%4,006.937978.4472%
Target2440.000056.8182%900015000000.001914.6041%0.001963.1245%
Difference+24+113.7700+15.2406%+69991000+3378025302150+3,893.1660+8.2596%+4,006.9360+15.3227%

Known prime factors (1 factor, 139.9 bits, 0.02670357% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
523907130216490479523818113437424921325679142217743139.9021242744327519233548257967777881624784
24 × 47 × 25073 × 254753 × 501691 × 696491 × 740434288603
2023-09-066964917404342886032.977e+11853.061,593.2

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-12-22ANONYMOUSv4_computers2000200000---0.000--0.144%
2002-01-22ANONYMOUSv4_computers4096409600---0.001--0.322%
2002-02-10Jocelyn Larouchev4_computers10000100000---0.000--0.354%
2002-06-23ANONYMOUSv4_computers327683276800---0.004--1.545%
2002-08-31ANONYMOUSv4_computers655366553600---0.009--2.220%
2003-04-27ANONYMOUSv4_computers13107213107200---0.018--3.022%
2011-05-27Jocelyn LaroucheManual testing10000001000000---0.021--1.978%
2012-07-14Jocelyn LaroucheManual testing10478141047814---0.022--2.016%
2013-01-28markrManual testing250000001000000000---1.652--10.808%
2023-01-16Jocelyn LaroucheManual testing10488149303594300---10.74--10.512%
2023-06-05Jocelyn LaroucheJoss104881455027422450---63.42--12.346%
2023-09-04linamentU2K7000000070000000---1.480--7.008%
2023-09-06linamentCyber70000000337802680215043139.9023,8930.0157,78622.864%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-06-06happy5214Manual testing1250000096250000027--1.262
2023-09-12masserManual testing100000007900000007771--1.029
2023-09-16masserManual testing1000000079000000065--1.029


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-03-15ANONYMOUSv4_computers253254--0.002--
2022-03-07LordJuliusManual testing254255--0.005--
2001-04-01ANONYMOUSv4_computers21256--0.018--
2002-01-02ANONYMOUSv4_computers21257--0.037--
2003-12-23ANONYMOUSv4_computers21258--0.073--
2016-02-23Mark RoseManual testing258260--0.220--
2016-02-23Mark RoseManual testing260261--0.293--
2015-07-09NRManual testing261262--0.586--
2015-09-08Gordon SpenceManual testing262263--1.874--
2015-09-08Gordon SpenceManual testing263264--3.747--
2017-11-10BloodERazorManual testing264265--7.132--
2018-05-23chuenkitManual testing265266--14.26--
2020-09-21Gordon SpenceManual testing266267--28.53--
2022-05-09Gordon SpenceManual testing267268--57.05--


ECM factoring results:
Total ECM effort:51.605 GHz-days
Estimated T-Level:29.863
DigitsB1CompleteFacMiss
201100063.9510.000%
25500009.2360.010%
302500000.97337.808%
3510000000.08092.311%
4030000000.00599.466%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002804.508
2500002500000058547.10


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-01-01Robert R. Fenichel6DE98918150BC79F0.008
2015-04-11MadPooManual testing6DE98918150BC79F0.008


PRP results:
dateuseridcompidcofactorsres64PRP
2023-09-06linamentCyber
1302164904795238181134374249213256791422177
5492BC6EC9740AABno


P-1 factor-bounds graph:
B1 = 70000000, B2 = 3378026802150 (P-1 stage 2)
B1 = 1048814, B2 = 55027422450 (P-1 stage 2)
B1 = 1048814, B2 = 9303594300 (P-1 stage 2)
B1 = 25000000, B2 = 1000000000 (P-1 stage 2)
B1 = 70000000 (P-1 stage 1)
B1 = 25000000 (P-1 stage 1)
B1 = 1048814 (P-1 stage 1)
B1 = 1047814 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 10000, B2 = 100000 (P-1 stage 2)
B1 = 2000, B2 = 200000 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
B1 = 4096 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
102
103
104
105
106
107
108
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
257
256
255
254
this exponent TF target: 44
TF double-checked to: 67.9
ECM T-Level=29.86 ~= 83-bit
250
260
270
280
290
2100
2110
2120
2130
2140
Last modified: 2023-09-25T11:53:03+00:00