is 2 202879 - 1
has 61073 decimal digits
takes 0.001 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
Actualunknown30000000102640764025803,739.164672.5806%3,739.164672.5806%72.5806%
PrimeNet2400.000055.0000%2200500000.000012.6720%0.000060.7024%5.7024%
GPU722440.000059.0909%3600800000.00018.8864%0.000162.7263%3.6354%
Difference-440.0000-59.0909%+29996400+10264076322580+3,739.1645+63.6942%+3,739.1645+9.8543%+9.8543%

Known prime factors (3 factors, 220.4 bits, 0.10863289% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20287938952769825.21596
25 × 3
-32322.249e-112.140e-74.354e-7
2028791774427620238662597535555592787.197437311801674560353101
3 × 11 × 53 × 1571 × 2073901 × 76742719
2018-02-09207390176742719173,250,4150.04110.0522
20287932018498521324143395079809820784133107.981789103320731178273628118480
24 × 5 × 13 × 157 × 4832822885418779235841
2022-06-0315748328228854187792358417.657e+111.760e+123.288e+12

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
202879691188691983763490307424661839287134112.413
2028791247209176627980931791419568512934446172941133.196
20287956814508134808337039357752458318580728133008527965
522938119
59195.178
20287922130824112238100119682464398680658035108168824648
71054972750701511
67220.393
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2021-05-03T14:21:15Oliver KruseOllaptop300000003000000000-
skipped known factor: 38952769
skipped known factor: 177442762023866259753555559
--1.282--43.597%
2022-02-05T19:34:28Oliver KruseThreadripper-PC3000000010264076402580-
skipped known factor: 38952769
skipped known factor: 177442762023866259753555559
--3,739--62.688%


Trial Factoring results:
No TF results for M202879


ECM factoring results:

Old Calculation Method

Total ECM effort:11.952 GHz-days
Estimated T-Level:28.109
DigitsB1CurvesCompleteFacMiss
2011000679 / 1006.7900.109%
2550000679 / 2802.4258.809%
30250000398 / 6400.62253.668%
3510000007 / 15660.00499.554%

New Calculation Method

Total ECM effort:11.952 GHz-days
Estimated T-Level:28.109
DigitsB1CompleteFacMiss
201100048.0360.000%
25500006.8310.108%
302500000.72248.574%
3510000000.06194.114%
4030000000.00499.579%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002811.372
250000250000003197.788
25000025000000290.708
2500003491516470.193
25000036000000140.391
2500003600000030.084
25000038500000140.403
5000005000000050.244
100000013788045470.769


Lucas-Lehmer results:
No L-L results for M202879


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-22T02:26:21Oliver KruseOllaptop
38952769
B018548813CEDF__no
2017-09-22T10:02:27Oliver KruseManual testing
38952769
B018548813CEDF__no
2017-09-22T10:02:49Oliver KruseManual testing
38952769
B018548813CEDF__no
2017-11-06T16:20:05kkmrkkblmbrbkc4.xlarge
38952769
B018548813CEDF__no
2018-02-10T04:21:41ANONYMOUSdory
38952769
177442762023866259753555559
D6ACB2EBB1D01C__no
2018-02-14T20:29:05noknopcr2-srv
38952769
177442762023866259753555559
no
2018-02-15T23:25:35Oliver KruseGTX-6
38952769
177442762023866259753555559
D6ACB2EBB1D01C__no
2018-02-16T01:42:47kkmrkkblmbrbkc5.large
38952769
177442762023866259753555559
E5C0919519C18E__no
2022-06-03T17:41:29SRJ2877LTOS
38952769
177442762023866259753555559
320184985213241433950798098207841
D6ACB2EBB1D01C62no


P-1 factor-bounds graph:
B1 = 30000000, B2 = 10264076402580 (P-1 stage 2)
B1 = 30000000, B2 = 3000000000 (P-1 stage 2)
B1 = 30000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-08-09T18:32:22+00:00