is 2 1907371 - 1
has 574176 decimal digits
takes 0.103 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L2F8B5B75B5ACAA73double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.578568.6567 %1000000300000000.20296.2205 %15.781470.6064 %
Target2610.161065.5738 %100008500000.00441.7592 %0.165466.1794 %
Difference+6+15.4174+3.0829 %+990000+29150000+0.1986+4.4613%+15.6160+4.4270 %

Known prime factors (1 factor, 63.3 bits, 0.00331738% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1907371111583394148133249272063.2752925057425853
3 × 975019141951
2013-11-2439750191419510.83684,178.77,804.6

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-06-05kurlykurlytop10000003000000012--0.20310.439%
2016-03-16alpertronManual testing5000001500000012---8.904%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2011-04-14GrunwalderGIMPv4_computers212560.005
2011-04-14GrunwalderGIMPv4_computers2562570.005
2002-01-08Jossv4_computers212580.020
2011-04-14GrunwalderGIMPv4_computers2572580.010
2011-04-14GrunwalderGIMPv4_computers2582590.020
2011-04-14GrunwalderGIMPv4_computers2592600.040
2009-05-25Architects Cubedi4l_12602610.081
2011-04-14GrunwalderGIMPv4_computers2602610.081
2011-02-19GrunwalderGIMPGWPrime022612620.161
2011-02-19GrunwalderGIMPGWPrime022622630.515


ECM factoring results:
Total ECM effort:39.155 GHz-days
Estimated T-Level:25.701
DigitsB1CompleteFacMiss
201100015.0610.000%
25500001.67518.729%
302500000.14086.917%
3510000000.01099.052%


ECM Summary

B1B2factorcurvesGHz-days
10.139
500005000000332.183
50000660000021616.91
50000670639070.552
250000400000004519.37


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-05-25ANONYMOUSv4_computers2F8B5B75B5ACAA730.103


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-2
11158339414813324927
4836E39D2CF3805B
2017-11-09kkmrkkblmbrbkold
11158339414813324927
4836E39D2CF3805B


CERT results:
No CERT results for M1907371


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
263
262
261
260
259
258
257
256
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
250
260
270
JSON version of this page
Last modified: 2024-02-29T14:28:04+00:00