is 2 2227747 - 1
has 670619 decimal digits
takes 0.146 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA6AF198E89EC2CF5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26713.338167.1642%500000150000000.12305.1899%13.461168.8683%1.7041%
PrimeNet2580.017262.0690%100001800000.00182.8697%0.019163.1575%1.0885%
GPU722620.275864.5161%110001800000.00191.6310%0.277765.0949%0.5788%
Difference+5+13.0623+2.6481%+489000+14820000+0.1211+3.5588%+13.1834+3.7734%+3.7734%

Known prime factors (1 factor, 77.8 bits, 0.00349413% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
22277472705556702359502307730392477.84060724056689550077
373 × 599 × 271784773951
2013-06-2459927178477395118,2511,411.72,636.7

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-27T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.281%
2010-10-23T07:38:00Oscar Östlin7501175011---0.007--0.782%
2011-01-13T07:47:00Oscar Östlin850001615000---0.016--2.466%
2016-04-08T10:50:30alpertronManual testing5000001500000012---0.123--5.190%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-01-10T19:49:00Sturle Sundegopher.ifi260261--0.069--
2012-04-20T04:47:00Sebastian HornbostelManual testing261262--0.138--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.772 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:0.772 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000090.772


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-14T00:00:00Dry Creek Photov4_computersA6AF198E89EC2CF50.146


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-09T22:18:10Oliver KruseGTX-2
270555670235950230773039
C36F2F32D3A2BD__no
2017-11-20T08:18:16ATHec2-1xf
270555670235950230773039
C36F2F32D3A2BD__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 85000, B2 = 1615000 (P-1 stage 2)
B1 = 85000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
262
261
250
260
270
280
290
2100
Last modified: 2017-11-20T08:18:16+00:00