factordbrpc · fdb
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Inverse home prime · Base 22 of 121 length 26 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
6 Fully factored 5 40301 191×211
7 Fully factored 6 102315 3×5×19×359
8 Fully factored 7 3831941 31×71×1741
9 Fully factored 9 407874091 67×6087673
10 Fully factored 10 2946433799<10> 41×337×213247
11 Fully factored 11 49954552381<11> 5309×9409409
12 Fully factored 12 100191392341<12> 712×19875301
13 Fully factored 13 4655908545…91<13> 7×53×149×5273×15973
14 Fully factored 15 8765595046…89<15> 72×521×14543×2360987
15 Fully factored 19 2850347003…05<19> 5×709×758573×1059946913<10>
16 Fully factored 22 1279641280…87<22> 17×7527301651…11<20>
17 Fully factored 22 1656006363…59<22> 443×37021847×100971822079<12>
18 Fully factored 22 5540916939…35<22> 5×38120087×2907085148…81<14>
19 Fully factored 23 7251310771…47<23> 32×107099×7522957234…17<17>
20 Fully factored 25 8529521690…53<25> 33×37×751×1136892110…97<20>
21 Fully factored 30 6238794768…21<30> 3×4703×4421854680…69<26>
22 Fully factored 32 1035845989…33<32> 32×587596193×1958726081…09<22>
23 Fully factored 34 2364709704…09<34> 32×7×1777×2112272069…59<29>
24 Fully factored 37 2394892044…89<37> 24671×4039097×1474884263<10>×1629509750…69<17>
25 Composite 38 4907042919…23<38> 4907042919…23<38>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (38 digits) of term #25:
49070429191020288146613727010337706223
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 '121' --type 72 --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":"121"},"type":72,"part":"last20","fr":0}}'