is 2 1971503 - 1
has 593482 decimal digits
takes 0.130 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.071768.6567%----15.071768.6567%0.0000%
PrimeNet2580.019563.7931%80001400000.00142.4720%0.020964.6881%0.8950%
GPU722620.311666.1290%80001000000.00121.1961%0.312966.5342%0.4051%
Difference+5+14.7601+2.5277%-8000-100000-0.0012-1.1961%+14.7588+2.1226%+2.1226%

Known prime factors (3 factors, 150.2 bits, 0.00761925% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19715033943007721.9111
1
-111.417e-139.534e-81.940e-7
19715034977942728640771431858.788126247404357
33 × 3671 × 1273721
2015-10-01367112737210.03890.00690.0124
19715038432469345447985765432169.515213858902204257
213858902204257
2021-04-091213858902204257116.171,110,8372,074,733

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
197150319628063024629662233890012580.699
197150333249285656386826008990848012891.425
197150341976349462659006084183652122574225664939128.303
1971503165513039765710699602978729604875029816280354346150.214
P-1 results:
No P-1 results for M1971503


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2015-10-01T11:45:49TJAOIManual testing258259*58.788180.0190.2630.040


ECM factoring results:

Old Calculation Method

Total ECM effort:4.410 GHz-days
Estimated T-Level:2.500
DigitsB1CurvesCompleteFacMiss
201100050 / 1000.50060.501%
255000050 / 2800.17983.620%

New Calculation Method

Total ECM effort:4.410 GHz-days
Estimated T-Level:2.500
DigitsB1CompleteFacMiss
20110001.96813.974%
25500000.18283.320%
302500000.01298.853%


ECM Summary

B1B2factorcurvesGHz-days
500005000000342.871
50000500000020.169
50000694743670.684
50000700643870.687


Lucas-Lehmer results:
No L-L results for M1971503


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:28:52alpertronManual testing
3943007
497794272864077143
D76C81150DA351__no
2017-10-20T13:46:16Oliver KruseThreadripper
3943007
497794272864077143
D76C81150DA351__no
2021-04-30T16:59:59Kirill Frolovshodan1
3943007
497794272864077143
843246934544798576543
CF39CA3DF6482715no


P-1 factor-bounds graph:
100
101
102
103
104
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
TF factor-bounds graph:
267
259
220
230
240
250
260
270
280
290
2100
Last modified: 2022-07-09T00:42:32+00:00