is 2 3895453 - 1
has 1172649 decimal digits
takes 0.486 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L42548EA1C5321D5Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2677.627867.1642%1000001303648501.30166.0386%8.929469.1470%1.9828%
PrimeNet2600.039463.3333%170003600000.00653.2470%0.045964.5239%1.1906%
GPU722640.913765.6250%240005000000.00902.2329%0.922766.3926%0.7676%
Difference+3+6.7141+1.5392%+76000+129864850+1.2926+3.8057%+8.0067+2.7544%+2.7544%

Known prime factors (1 factor, 66.7 bits, 0.00171310% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
38954531226310294867556858732166.73315740278407512
23 × 316037 × 6225647
2009-10-2131603762256474.91400.11540.1163

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-31T05:07:00Carsten Kossendeyleela20000275000---0.006--1.172%
2022-03-04T19:36:15Jocelyn LaroucheManual testing9000090000---0.016--0.968%
2022-03-22T11:08:07Jocelyn LaroucheManual testing100000100000---0.018--1.028%
2022-05-25T22:30:43Jocelyn LaroucheManual testing100000130364850---1.302--6.039%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-02-24T08:21:00S485122USB-A260261--0.039--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-31T00:00:00ANONYMOUSv4_computers42548EA1C5321D5B0.486


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T16:57:57kkmrkkblmbrbkManual testing
122631029486755685873
3B9BBC10772D1A__no
2017-12-27T19:42:01Oliver KruseGTX-0
122631029486755685873
3B9BBC10772D1A__no


P-1 factor-bounds graph:
B1 = 100000, B2 = 130364850 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 20000, B2 = 275000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
267
261
250
260
270
280
290
2100
Last modified: 2022-05-25T22:30:43+00:00