factordbrpc · fdb
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Home prime · Base 15 of 134 length 21 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
1 Fully factored 3 517 11×47
2 Fully factored 4 2522 2×13×97
3 Fully factored 4 9772 22×7×349
4 Fully factored 7 1643974 2×193×4259
5 Fully factored 8 32556134 2×13×1252159
6 Fully factored 9 491049034 2×7×19×23×80263
7 Fully factored 13 1425668170…88<13> 23×13×13708347797<11>
8 Fully factored 15 2784589603…22<15> 2×128389×1084434649<10>
9 Fully factored 16 4221438185…24<16> 22×17×89×349×1998646963<10>
10 Fully factored 20 1404646053…38<20> 2×53×127×153871×6781106119<10>
11 Fully factored 22 3307622819…94<22> 2×11×199×359×376729×5586203093<10>
12 Fully factored 24 9285206999…43<24> 13×109×594401×1102407625…79<16>
13 Fully factored 25 4485080785…04<25> 22×72×6827×120587×2779609613…01<14>
14 Fully factored 29 3647208846…01<29> 7×353047×1475808703…69<23>
15 Fully factored 30 1256652795…69<30> 1097×29167×47143×52963×1572994193…59<13>
16 Fully factored 32 1847672016…59<32> 195809×9436093420…51<26>
17 Fully factored 33 2197514726…26<33> 2×2411×15919×1969244653<10>×1453748000…69<16>
18 Fully factored 34 2313338933…44<34> 23×17×19×117431×7623668411…11<25>
19 Fully factored 40 1386578564…36<40> 22×113×6333150516…89<15>×4843800385…37<22>
20 Composite 42 3155260262…37<42> 1657×1904200520…41<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 #20:
190420052025257852943349868526421061641
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 '134' --type 33 --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":"134"},"type":33,"part":"last20","fr":0}}'