is 2 2153089 - 1
has 648145 decimal digits
takes 0.142 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L350757D66BB29963double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26713.800667.1642%500000150000000.12305.1687%13.923668.8614%1.6972%
PrimeNet2580.017862.0690%90001700000.00172.7345%0.019563.1062%1.0372%
GPU722620.285364.5161%100001600000.00171.5182%0.287165.0549%0.5387%
Difference+5+13.5153+2.6481%+490000+14840000+0.1213+3.6504%+13.6365+3.8065%+3.8065%

Known prime factors (1 factor, 62.7 bits, 0.00291015% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
215308972769735382593708311962.6581689891485735
5 × 79 × 4241 × 1008773
2009-01-06424110087730.67960.00560.0098

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-07T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.279%
2016-03-25T12:22:30alpertronManual testing5000001500000012-
skipped known factor: 7276973538259370831
--0.123--5.169%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-29T00:00:00dawiltsv4_computers21258--0.018--
2022-03-09T10:13:25LordJuliusManual testing21260--0.071--
2009-01-04T22:18:00Sturle Sundegehry.ifi260261--0.071--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.244 GHz-days
Estimated T-Level:1.200
DigitsB1CurvesCompleteFacMiss
201100024 / 1000.24078.568%
255000024 / 2800.08691.772%

New Calculation Method

Total ECM effort:2.244 GHz-days
Estimated T-Level:1.200
DigitsB1CompleteFacMiss
20110000.96837.986%
25500000.09091.397%
302500000.00699.431%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000100.854
50000698875170.695
50000700000070.696


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-14T00:00:00dawiltsv4_computers350757D66BB299630.142


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-08T21:55:00Oliver KruseGTX-1
7276973538259370831
248343F0CA8A48__no
2017-11-18T16:57:30kkmrkkblmbrbkc4.xlarge
7276973538259370831
248343F0CA8A48__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
261
260
258
250
260
270
280
290
2100
Last modified: 2022-08-08T23:21:03+00:00