factordb · sequences

Sequence

Start with

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whole sequence last 20 terms last term range to

Terminates

Aliquot variants · Augmented · σ(n) − n + 1 of 4420 length 8 The sequence reaches the fixed point 2. ↓ .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	4	4420	2²×5×13×17
1	Fully factored	4	6165	3²×5×137
2	Fully factored	4	4600	2³×5²×23
3	Fully factored	4	6561	3⁸
↳	Continues Reaches 3281 and continues as that sequence.
4	Fully factored	4	3281	17×193
↳	Continues Reaches 212 and continues as that sequence.
5	Fully factored	3	212	2²×53
↳	Continues Reaches 167 and continues as that sequence.
6	Fully factored	3	167	167
↳	Continues Reaches 2 and continues as that sequence.
7	Fully factored	1	2	2
8	terminus	1	0	-
↳	Terminates The sequence reaches the fixed point 2 and terminates.

From the command linefdb · curl

fdb

fdb seq view '4420' --type 54 --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":"4420"},"type":54,"part":"last20","fr":0}}'