factordb · sequences

Sequence

Start with

Show

whole sequence last 20 terms last term range to

Terminates

Mid-divisor concatenation · Base 3 of 20916 length 9 The sequence reaches a prime. ↓ .elf file

Show sequence-development graph

Term size (digits) across the sequence — How the sequence develops - decimal digits of each term vs iteration.

n	Status	Digits	Term	Factorization
0	Fully factored	5	20916	2²×3²×7×83
1	Fully factored	5	30784	2⁶×13×37
2	Fully factored	5	36172	2²×9043
3	Fully factored	5	87775	5²×3511
4	Fully factored	6	167536	2⁴×37×283
5	Fully factored	6	216350	2×5²×4327
6	Fully factored	6	332377	509×653
7	Fully factored	6	371714	2×7²×3793
8	Fully factored	6	646771	646771
↳	Terminates The sequence reaches a prime and terminates.

From the command linefdb · curl

fdb

fdb seq view '20916' --type 141 --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":"20916"},"type":141,"part":"last20","fr":0}}'