factordbrpc · fdb
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Inverse home prime · Base 24 of 8409 length 22 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
2 Fully factored 9 187525515 3×5×2741×4561
3 Fully factored 11 36319107003<11> 3×17×15329×46457
4 Fully factored 13 8878079785…47<13> 3×2959359928…49<13>
5 Fully factored 14 7102463828…79<14> 3×19×47×283×3527×26561
6 Fully factored 17 7016972419…55<17> 32×5×11×13×73×149375151281<12>
7 Fully factored 21 6851048628…03<21> 3×401×8669×6569350289…29<14>
8 Fully factored 23 1255422390…87<23> 3×103×403603×1006646539…81<15>
9 Fully factored 26 1108069341…03<26> 32×17×797×9086930081…83<20>
10 Fully factored 29 1736539381…03<29> 3×439×1879×7017332929…21<22>
11 Fully factored 31 1341033206…31<31> 32×40387097×2004592643<10>×1840467923…29<13>
12 Fully factored 33 9291736354…11<33> 3×443×6991524721…59<30>
13 Fully factored 34 9665083774…51<34> 3×7×41×114617×2381749×24910733×1650710583…19<13>
14 Fully factored 39 2764932468…51<39> 33×23×179×197×2389×25506096457<11>×2072113420…69<18>
15 Fully factored 44 3470780238…19<44> 3×1156926746…73<44>
16 Fully factored 45 2776624191…55<45> 32×5×72×1649251×11469461×6657002870…01<28>
17 Fully factored 50 8066007316…91<50> 3×5501×4887600628…97<46>
18 Fully factored 52 1621588586…99<52> 3×18217×19997×6605040553…97<16>×2246478314…61<27>
19 Fully factored 56 2167396195…31<56> 33×379×42749111051<11>×1695634141…97<13>×2921972282…81<29>
20 Fully factored 59 6765866270…07<59> 3×1217×1867×268861×1319635170…51<20>×2797599664…61<28>
21 Composite 62 8955021028…55<62> 3×5×322039×1853817090…03<56>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (56 digits) of term #21:
18538170900983014331087642895082139661890812575136682803
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 '8409' --type 74 --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":"8409"},"type":74,"part":"last20","fr":0}}'