factordb · sequences

Sequence

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whole sequence last 20 terms last term range to

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Distinct-prime home prime, descending · Base 16 of 58 length 14 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.

n	Status	Digits	Term	Factorization
0	Fully factored	2	58	2×29
1	Fully factored	3	466	2×233
2	Fully factored	4	3730	2×5×373
3	Fully factored	5	95570	2×5×19×503
4	Fully factored	8	32969554	2×31×59×9013
5	Fully factored	10	9451057650<10>	2×3×5²×23×2739437
6	Fully factored	13	2872507987…50<13>	2×5³×11×18679×55921
7	Fully factored	14	1501125564…58<14>	2×11×3557×6337×30271
8	Fully factored	16	2080213926…38<16>	2×1040106963…69<16>
9	Fully factored	17	1664171140…06<17>	2×3×2773618568…51<16>
10	Fully factored	18	7100463534…06<18>	2×3×342697×345322716283<12>
11	Fully factored	20	9269686081…30<20>	2×5×11×349×14519×166306877533<12>
12	Fully factored	24	1828563456…14<24>	2×1543×17417×3402050551…47<16>
13	Composite	26	1461169585…14<26>	2×3×2435282643…19<25>
↳	Open Open - the last known term is composite and not yet fully factored.

Open end - submit a factor of the remaining composite (25 digits) of term #13:

2435282643235597870796819

Check for factors - let the server run a small P-1 / P+1 / ECM step on the composite:

From the command linefdb · curl

fdb

fdb seq view '58' --type 134 --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":"58"},"type":134,"part":"last20","fr":0}}'