factordb · sequences

Sequence

Start with

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whole sequence last 20 terms last term range to

Terminates

Aliquot variants · Infinitary · σ∞(n) − n of 70 length 8 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	2	70	2×5×7
1	Fully factored	2	74	2×37
↳	Continues Reaches 40 and continues as that sequence.
2	Fully factored	2	40	2³×5
3	Fully factored	2	50	2×5²
↳	Continues Reaches 28 and continues as that sequence.
4	Fully factored	2	28	2²×7
↳	Continues Reaches 12 and continues as that sequence.
5	Fully factored	2	12	2²×3
↳	Continues Reaches 8 and continues as that sequence.
6	Fully factored	1	8	2³
↳	Continues Reaches 7 and continues as that sequence.
7	Fully factored	1	7	7
8	terminus	1	0	-
↳	Terminates The sequence reaches a prime and terminates.

From the command linefdb · curl

fdb

fdb seq view '70' --type 61 --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":"70"},"type":61,"part":"last20","fr":0}}'