factordbrpc · fdb
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Distinct-prime home prime, descending · Base 16 of 19409 length 19 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.
nStatus DigitsTermFactorization
0 Fully factored 5 19409 13×1493
1 Fully factored 5 23901 3×31×257
2 Fully factored 7 1053171 32×7×73×229
3 Fully factored 8 15026547 3×1979×2531
4 Fully factored 9 165903283 7×13×739×2467
5 Fully factored 10 2587026391<10> 17×152178023
6 Fully factored 11 38957573905<11> 5×421×18507161
7 Fully factored 13 1212885310…37<13> 14633×82886989
8 Fully factored 13 5432081725…37<13> 32×17×95957×369997
9 Fully factored 16 1589125407…59<16> 53×61×109×337×13381231
10 Fully factored 18 9195511980…01<18> 3×43×191×3732096262…59<14>
11 Fully factored 20 3913386570…11<20> 13×751×4008385301…97<16>
12 Fully factored 21 2626935391…21<21> 35×7×1783×8661512466…87<14>
13 Fully factored 20 9082254096…75<20> 52×13×229×62323×19580620681<11>
14 Fully factored 20 8409812546…41<20> 3×53×163×3244902012…73<16>
15 Fully factored 22 3402526372…47<22> 29×37×3171040422…39<19>
16 Fully factored 24 2078173051…05<24> 5×11×19×1988682345…09<21>
17 Fully factored 26 1303302861…69<26> 3×13×79×263×2003×295271×27195444271<11>
18 Composite 29 3135421252…63<29> 3×11131×9389456630…91<24>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (24 digits) of term #18:
938945663093990690754691
Check for factors - let the server run a small P-1 / P+1 / ECM step on the composite:
level 0 done · takes up to a minute
From the command linefdb · curl
fdb
fdb seq view '19409' --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":"19409"},"type":134,"part":"last20","fr":0}}'