is 2 1263403 - 1
has 380323 decimal digits
takes 0.040 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF88971119C00A7F8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.519068.6567%300000100000000.03814.1889%23.557069.9697%1.3129%
PrimeNet2560.007662.5000%5500900000.00052.4416%0.008163.4156%0.9156%
GPU722600.121665.0000%5500340000.00030.9084%0.121965.3179%0.3179%
Difference+7+23.3974+3.6567%+294500+9966000+0.0378+3.2806%+23.4351+4.6517%+0.9950%

Known prime factors (1 factor, 61.2 bits, 0.00484788% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
126340327387711600177360711961.2481083886598345
5 × 89 × 2435700221
2010-04-018924357002210.44236.098711.391

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.239%
2003-12-23T00:00:00eteov4_computers2000005000000---0.021--3.419%
unknown30000010000000---0.038--4.189%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-10T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.030--
2022-03-07T17:32:04LordJuliusManual testing258260--0.091--
2009-02-15T17:47:00Sturle Sundeghini.ifi260261--0.122--


ECM factoring results:
Total ECM effort:19.166 GHz-days
Estimated T-Level:25.668
DigitsB1CompleteFacMiss
201100014.1220.000%
25500001.59020.385%
302500000.13487.489%
3510000000.00999.084%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002499.56
25000025000000509.60


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-08-31T00:00:00ANONYMOUSv4_computersF88971119C00A7F80.040


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T20:24:41Oliver KruseGTX-1
2738771160017736071
C0177654EA487E__no
2017-10-21T06:30:13kkmrkkblmbrbkc4.xlarge
2738771160017736071
C0177654EA487E__no


P-1 factor-bounds graph:
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-07T17:32:04+00:00