is 2 1951843 - 1
has 587564 decimal digits
takes 0.106 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
Actual26715.223568.6567%500000150000000.10155.1081%15.325070.2578%1.6010%
PrimeNet2580.019763.7931%80001400000.00122.4672%0.020964.6864%0.8933%
GPU722620.314866.1290%8000900000.00101.1533%0.315766.5197%0.3906%
Difference+5+14.9088+2.5277%+492000+14910000+0.1005+3.9547%+15.0093+3.7381%+3.7381%

Known prime factors (3 factors, 209.5 bits, 0.01073095% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1951843293532828199371444.7397519376
24 × 233 × 2017
-23320171.886e-62.597e-53.730e-5
195184316721633460902925721251832580.468428354981955590837
7 × 1100387 × 55610952193
2021-07-26110038755610952193150,355238.42445.14
1951843229200721217208221794674232684.2455871392351157552677
6361 × 923029767514157
2022-05-1263619230297675141573,109,5243,955,8757,388,473

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
19518434908348361892055283533205661121217347138125.207
195184367277935924222479397316765249826641235139128.983
19518433832610449168752155865413203062949489577422641340950164.713
195184311249969845309616147930456421984932559914776326010
74841069335233
64209.451
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:14alpertronManual testing5000001500000012-
skipped known factor: 29353282819937
--0.101--5.108%


Trial Factoring results:
No TF results for M1951843


ECM factoring results:

Old Calculation Method

Total ECM effort:21.071 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:21.071 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
201100010.6280.002%
25500001.00436.624%
302500000.06493.795%
3510000000.00399.699%


ECM Summary

B1B2factorcurvesGHz-days
500005000000211.461
50000500000040.278
50000670000070.554
50000675000070.556
50000750000017614.71
500007500000423.511


Lucas-Lehmer results:
No L-L results for M1951843


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T05:48:17Oliver KruseGTX-2
29353282819937
3B0C17777F2C07__no
2017-11-11T13:23:11kkmrkkblmbrbkc4.xlarge
29353282819937
3B0C17777F2C07__no
2021-07-26T19:58:26SRJ2877LTOS
29353282819937
1672163346090292572125183
8009F3FD3BF937CCno
2022-05-12T19:06:26aperson12012_VP113
29353282819937
1672163346090292572125183
22920072121720822179467423
8009F3FD3BF937CCno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
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104
105
106
107
101
102
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105
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109
1010
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TF factor-bounds graph:
267
240
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260
270
280
290
2100
Last modified: 2022-05-12T19:06:26+00:00