factordbrpc · fdb
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Home prime · Base 13 of 2642 length 19 Not fully computed yet - the last known term is composite. ↓ .elf file
Show sequence-development graph
Term size (digits) across the sequence
How the sequence develops - decimal digits of each term vs iteration.
nStatus DigitsTermFactorization
0 Fully factored 4 2642 2×1321
1 Fully factored 4 5715 32×5×127
2 Fully factored 5 93246 2×3×15541
3 Fully factored 6 843810 2×3×5×11×2557
4 Fully factored 9 142150654 2×47×1512241
5 Fully factored 10 1859833706<10> 2×53×457×38393
6 Fully factored 12 319120431205<12> 5×181×352619261
7 Fully factored 13 9108801849…47<13> 59×31957×4831069
8 Fully factored 16 1376592281…17<16> 19×173×13127×31903633
9 Fully factored 17 7512101880…84<17> 27×3×7349×26619628949<11>
10 Fully factored 24 5353064839…19<24> 32×293×3163×4243×1059703×14273681
11 Fully factored 29 2287004962…61<29> 119374538183<12>×1915823087…67<18>
12 Fully factored 29 7943380042…70<29> 2×5×43×2357×7837495478…67<23>
13 Fully factored 32 3727254010…34<32> 2×3×4231×1468232100…69<28>
14 Fully factored 34 5874462805…69<34> 7×4523×162008843×3880710931<10>×295116516713<12>
15 Fully factored 37 3169577690…53<37> 11×771401×1414358143…61<15>×2641004391…43<16>
16 Fully factored 38 6423735665…72<38> 22×193×15361×5401969×929137423×1079241984…93<16>
17 Fully factored 43 4617705930…23<43> 3×1021×5910161×2550820882…61<33>
18 Composite 46 1251434687…46<46> 2×1455983×4297559407…81<39>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (39 digits) of term #18:
429755940728810909144259254110007143981
Check for factors - let the server run a small P-1 / P+1 / ECM step on the composite:
level 0 done · takes up to a minute
From the command linefdb · curl
fdb
fdb seq view '2642' --type 31 --part last20
curl
curl -s 'https://factordb.com:4059/rpc' -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"sequence_view","params":{"start":{"expr":"2642"},"type":31,"part":"last20","fr":0}}'