is 2 1959973 - 1
has 590011 decimal digits
takes 0.106 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.160468.6567 %500000150000000.10155.1106 %15.261870.2586 %
Target2620.313566.1290 %80004500000.00251.1544 %0.316066.5200 %
Difference+5+14.8469+2.5277 %+492000+14550000+0.0990+3.9562%+14.9459+3.7385 %

Known prime factors (3 factors, 148.3 bits, 0.00756810% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1959973199917247927.57551
3 × 17
-3179.123e-122.960e-74.803e-7
19599737424263575172491549.399189397088
25 × 23 × 277 × 929
2014-04-292779293.826e-52.458e-54.435e-5
195997330277118660039667108792271.359772386116034243
3 × 17 × 15144825804593
2018-05-251715144825804593243.9264,907121,228

4 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-17alpertronManual testing5000001500000012
skipped known factor: 199917247
skipped known factor: 742426357517249
---8.166%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2014-04-29TJAOIManual testing??49.39915


ECM factoring results:
Total ECM effort:21.001 GHz-days
Estimated T-Level:25.319
DigitsB1CompleteFacMiss
201100010.6060.002%
25500001.00236.713%
302500000.06493.811%
3510000000.00399.700%


ECM Summary

B1B2factorcurvesGHz-days
500005000000292.019
50000500000030.209
50000675000070.556
50000709270270.569
50000750000021117.65


Lucas-Lehmer results:
No L-L results for M1959973


PRP results:
dateuseridcompidcofactorsres64
2017-10-05Oliver KruseGTX-0
199917247
742426357517249
FD604D859343D40C
2017-11-11kkmrkkblmbrbkc4.xlarge
199917247
742426357517249
FD604D859343D40C
2018-05-27Kingaiiai
199917247
742426357517249
3027711866003966710879
3C063821C75E6B2C
2018-05-28ANONYMOUSdory
199917247
742426357517249
3027711866003966710879
3C063821C75E6B2C
2018-05-28Gabriel Lignelli
199917247
742426357517249
3027711866003966710879
3C063821C75E6B2C


CERT results:
No CERT results for M1959973


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=25.32 ~= 67-bit
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Last modified: 2024-02-09T03:30:02+00:00