is 2 1372207 - 1
has 413076 decimal digits
takes 0.052 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB301EFE27B6E6CF1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26721.654168.6567%500000150000000.07144.8953%21.725570.1911%1.5344%
PrimeNet2560.007062.5000%60001000000.00062.6215%0.007663.4831%0.9831%
GPU722600.111965.0000%5500600000.00051.1383%0.112465.3984%0.3984%
Difference+7+21.5422+3.6567%+494500+14940000+0.0709+3.7570%+21.6131+4.7927%+4.7927%

Known prime factors (1 factor, 79.1 bits, 0.00576312% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
13722076397780724431738739755692479.082233120102303505912
23 × 3 × 11 × 10487 × 124753 × 674953
2014-02-18124753674953130,0120.00860.0141

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers15000228750---0.001--0.813%
unknown50000015000000---0.071--4.895%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-03T00:00:00ANONYMOUSv4_computers21257--0.014--
2003-06-30T00:00:00ANONYMOUSv4_computers21258--0.028--
2022-03-07T17:32:38LordJuliusManual testing258260--0.084--
2009-02-15T19:18:00Sturle Sundeherrick.ifi260261--0.112--
2012-08-10T08:42:00Sebastian HornbostelManual testing261262--0.224--
2013-01-23T08:21:00dbaughManual testing262263--0.715--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.182 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000299 / 1002.9904.954%
2550000299 / 2801.06834.309%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.182 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.5770.000%
25500001.64419.326%
302500000.14086.905%
3510000000.01099.023%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024911.68
250000350000005013.51


Lucas-Lehmer results:
No L-L results for M1372207


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T10:45:28Oliver KruseGTX-2
639778072443173873975569
8D1A17CF5871EB__no
2017-10-25T08:32:02kkmrkkblmbrbkc4.xlarge
639778072443173873975569
8D1A17CF5871EB__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
267
263
262
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-07T17:32:38+00:00