factordbrpc · fdb
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Home prime · Base 22 of 20519 length 17 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 5 20519 172×71
1 Fully factored 6 189315 32×5×7×601
2 Fully factored 9 356847025 52×67×213043
3 Fully factored 11 13054597155<11> 32×5×290102159
4 Fully factored 13 3799197165…83<13> 19×457×437544301
5 Fully factored 14 2407847423…65<14> 3×5×67×23958680833<11>
6 Fully factored 16 1889455160…49<16> 31×1206827×50504477
7 Fully factored 17 1825069732…53<17> 43×151×974443×2884547
8 Fully factored 18 5567806834…35<18> 5×7×16183×983008065607<12>
9 Fully factored 20 3310831499…27<20> 193×523×3851×85173513343<11>
10 Fully factored 23 2642458094…27<23> 13×797×1933×1319394231…79<16>
11 Fully factored 26 1905660479…35<26> 5×19×37×4059619×1335472414…31<16>
12 Fully factored 28 4138885495…11<28> 3×41×3833×10111×8682511564…39<18>
13 Fully factored 31 1053460240…87<31> 1019×1033817704…73<28>
14 Fully factored 32 1581535231…41<32> 132×223×349×153743×846563×9238622932…23<13>
15 Fully factored 34 2249384626…59<34> 3×79×569×118619×1406205692…37<24>
16 Composite 37 5566181747…41<37> 72×409×1059349×2621796225…49<27>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (27 digits) of term #16:
262179622543407064636929049
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 '20519' --type 39 --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":"20519"},"type":39,"part":"last20","fr":0}}'