factordbrpc · fdb
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Inverse home prime · Base 16 of 19409 length 18 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 19409 13×1493
1 Fully factored 5 23901 3×31×257
2 Fully factored 7 1053171 32×7×73×229
3 Fully factored 9 240424755 3×5×16028317
4 Fully factored 10 4103249235<10> 3×5×1117×244897
5 Fully factored 12 256793402707<12> 191×769×1748333
6 Fully factored 13 1833260220…63<13> 103×17798642921<11>
7 Fully factored 13 4556452587…79<13> 3×1518817529…93<13>
8 Fully factored 14 2430108046…91<14> 13×1869313882…07<13>
9 Fully factored 14 2990902211…25<14> 52×7349×162792337
10 Fully factored 16 2731202202…21<16> 103×173×200183×765673
11 Fully factored 17 5261666103…07<17> 32×3413×12149×140995079
12 Fully factored 19 9689108063…47<19> 33×72×11×133439×4989401941<10>
13 Fully factored 23 8777448719…59<23> 11×1475521837<10>×5407916464…37<13>
14 Fully factored 24 3716291896…35<24> 5×13×487×953×23599×522012616571<12>
15 Fully factored 27 1469334890…93<27> 3×101×863×1307×221951×1937022536…41<13>
16 Fully factored 30 1395771835…91<30> 32×1550857595…99<29>
17 Composite 31 3970195444…95<31> 5×2671×31849×9334094500…61<22>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (22 digits) of term #17:
9334094500914468090161
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 '19409' --type 66 --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":"19409"},"type":66,"part":"last20","fr":0}}'