is 2 1283 - 1
has 387 decimal digits
takes 0.000 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
Actual26723,159.717583.5821%100000000000022328434186491294782,876,234.795343.4301%2,899,394.512890.7124%7.1303%
PrimeNet2400.000172.5000%500100000.00001.7143%0.000172.9714%0.4714%
GPU722440.001875.0000%500100000.00000.6576%0.001875.1644%0.1644%
Difference+23+23,159.7157+8.5821%+999999999500+2232843418649119478+2,876,234.7953+42.7724%+2,899,394.5109+15.5480%+15.5480%

Known prime factors (1 factor, 131.8 bits, 10.27479560% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1283482467534611425054119824290421439619231940131.8261880232013294719618549588037495867573
11 × 359 × 42284727795787 × 11260061690076886171
2014-04-2342284727795787112600616900768861711.314e+1414,505,46927,090,410

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-02-11T00:00:00ANONYMOUSv4_computers100001000000---1.51169e-6--0.207%
2001-02-11T00:00:00ANONYMOUSv4_computers1000000100000000---0.000--3.253%
2001-05-20T00:00:00ANONYMOUSv4_computers30000000004290000000---0.073--9.937%
2017-03-10T02:27:43ZacHFXManual testing100000010000000012---0.000--3.253%
2017-04-21T22:54:16nordiManual testing797409835763792786852112---1.000--18.316%
2018-12-08T22:33:54Jocelyn LaroucheManual testing1000000000010000000000---0.236--11.233%
2018-12-09T12:18:27Jocelyn LaroucheManual testing2000000000020000000000---0.473--12.363%
2018-12-09T21:29:41Jocelyn LaroucheManual testing3000000000030000000000---0.709--13.033%
2018-12-11T02:09:41Jocelyn LaroucheManual testing6200000000010200000000012---1.517--15.212%
2018-12-11T08:57:10Jocelyn LaroucheManual testing6200000000020000000000012---1.644--16.496%
2018-12-11T22:39:14Jocelyn LaroucheManual testing6200000000040000000000012---1.901--17.789%
2018-12-11T22:39:14Jocelyn LaroucheManual testing6200000000062000000000012---2.185--18.593%
2018-12-12T22:05:12Jocelyn LaroucheManual testing62000000000140000000000012---3.189--20.058%
2020-11-30T10:43:47Oliver KruseManual testing250000000000040000000000000012---571.1--30.477%
2021-03-27T16:37:19nordiManual testing10000000000002232843418649129478---2,876,235--43.430%
2021-12-04T19:12:33Oliver KruseOllaptop2500000000000503160871613400---704.0--30.887%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-06-01T02:29:21ZacHFX5950X10000000101000000027--0.002
2021-07-19T10:10:00ViliamF3100000000022100000000027--0.314


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-01-19T00:00:00ANONYMOUSv4_computers254255--1.870--
2000-07-12T00:00:00ANONYMOUSv4_computers21256--7.482--


ECM factoring results:

Old Calculation Method

Total ECM effort:18,961.130 GHz-days
Estimated T-Level:56.666
DigitsB1CurvesCompleteFacMiss
201100073124 / 100731.2400.000%
255000073124 / 280261.1570.000%
3025000073124 / 640114.2560.000%
35100000073124 / 156646.6950.000%
40300000073124 / 458815.9380.000%
451100000073025 / 92017.9370.036%
504400000073025 / 165504.4121.212%
5511000000056684 / 408301.38824.950%
6026000000035107 / 1053620.33371.662%
6580000000025427 / 1942380.13187.730%
7024000000007436 / 3508600.02197.903%
7572000000002800 / 5676150.00599.508%

New Calculation Method

Total ECM effort:18,961.130 GHz-days
Estimated T-Level:56.666
DigitsB1CompleteFacMiss
201100033,808.8000.000%
255000013,937.5320.000%
302500005,088.0600.000%
3510000001,566.2960.000%
403000000427.2270.000%
4511000000105.7750.000%
504400000023.9260.000%
551100000004.9810.687%
602600000000.97337.799%
658000000000.17883.685%
7024000000000.02997.162%
7572000000000.00499.554%


ECM Summary

B1B2factorcurvesGHz-days
44000000440000000014,677219.7
100000000100000000001,66456.61
110000000110000000992.512
1100000001100000000021,173792.4
1100000001100000000040315.08
200000000200000000000012.259
260000000260000000009,680856.3
80000000080000000000154.083
8500000008500000000017,9765,198
29000000002900000000004,6364,574
76000000007600000000002,8007,240


Lucas-Lehmer results:
No L-L results for M1283


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-25T08:10:49csabaoffice2AC6FA81B13AFA__?
2017-09-26T00:20:42George WoltmanManual testing
4824675346114250541198242904214396192319
2AC6FA81B13AFA__no
2017-10-02T09:48:14kkmrkkblmbrbkManual testing
4824675346114250541198242904214396192319
2AC6FA81B13AFA__no
2020-04-17T12:30:32Oliver KruseIOS-1
4824675346114250541198242904214396192319
12AFB9E5948AEB7Fno
2020-08-12T10:14:44_p95holder_TFL16_PRPt11-E_b
4824675346114250541198242904214396192319
12AFB9E5948AEB7Fno


P-1 factor-bounds graph:
B1 = 1000000000000, B2 = 2232843418649129478 (P-1 stage 2)
B1 = 2500000000000, B2 = 503160871613400 (P-1 stage 2)
B1 = 2500000000000, B2 = 400000000000000 (P-1 stage 2)
B1 = 2500000000000 (P-1 stage 1)
B1 = 1000000000000 (P-1 stage 1)
B1 = 62000000000, B2 = 1400000000000 (P-1 stage 2)
B1 = 62000000000, B2 = 620000000000 (P-1 stage 2)
B1 = 62000000000, B2 = 400000000000 (P-1 stage 2)
B1 = 62000000000, B2 = 200000000000 (P-1 stage 2)
B1 = 62000000000, B2 = 102000000000 (P-1 stage 2)
B1 = 62000000000 (P-1 stage 1)
B1 = 7974098357, B2 = 637927868521 (P-1 stage 2)
B1 = 30000000000 (P-1 stage 1)
B1 = 20000000000 (P-1 stage 1)
B1 = 10000000000 (P-1 stage 1)
B1 = 7974098357 (P-1 stage 1)
B1 = 3000000000, B2 = 4290000000 (P-1 stage 2)
B1 = 3000000000 (P-1 stage 1)
B1 = 1000000, B2 = 100000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 10000, B2 = 1000000 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-12-04T19:12:33+00:00