factordb · sequences

Sequence

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whole sequence last 20 terms last term range to

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Conway climb · Base 17 of 15 length 15 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	15	3×5
1	Fully factored	2	56	2³×7
2	Fully factored	3	636	2²×3×53
3	Fully factored	6	177788	2²×13²×263
4	Fully factored	7	3071466	2×3³×23×2473
5	Fully factored	9	897465096	2³×3⁵×11×41969
6	Fully factored	11	15263003593<11>	73×5573×37517
7	Fully factored	12	509695793243<12>	7×13×4273×1310801
8	Fully factored	12	926868341974<12>	2×401×8431×137077
9	Fully factored	16	1212810183…63<16>	3×45989×71549×122861
10	Fully factored	17	3516757354…98<17>	2×107×7207×22802061301<11>
11	Fully factored	19	6785490638…25<19>	5²×11×83×139×331×78893×81901
12	Fully factored	22	4265837192…53<22>	131×10861×570139×5258748697<10>
13	Fully factored	24	1084760519…40<24>	2²×5×7×31×35839×6149491×113409409
14	Composite	28	2509330284…70<28>	2×5×2509330284…37<27>
↳	Open Open - the last known term is composite and not yet fully factored.

Open end - submit a factor of the remaining composite (27 digits) of term #14:

250933028437216227744125837

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 '15' --type 102 --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":"15"},"type":102,"part":"last20","fr":0}}'