factordbrpc · fdb
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Home prime · Base 21 of 1570 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 4 1570 2×5×157
1 Fully factored 5 20884 22×23×227
2 Fully factored 7 8567534 2×4283767
3 Fully factored 9 175816009 29×6062621
4 Fully factored 10 2493280130<10> 2×5×11×19×359×3323
5 Fully factored 11 85675514699<11> 277×309297887
6 Fully factored 12 499210823744<12> 26×29×251×439×2441
7 Fully factored 19 6812231832…32<19> 23×1657×1424077×360863911
8 Fully factored 23 6309345817…31<23> 113×41×47×251×8263×11860775551<11>
9 Fully factored 27 1530064134…86<27> 2×90439×6572441×1287055254…57<15>
10 Fully factored 29 1440213957…59<29> 223×607×1765429×17184553×3507074287<10>
11 Fully factored 32 2736888257…79<32> 103×2657173065…93<30>
12 Fully factored 33 2656535474…76<33> 22×19×281×1243929328…71<29>
13 Fully factored 35 5105852061…75<35> 52×2042340824…71<34>
14 Fully factored 37 2626831044…81<37> 257×5807×73450159×10523896211<11>×2277077931…31<13>
15 Fully factored 39 1290959311…45<39> 5×752632987×3430514828…47<29>
16 Fully factored 40 1197260533…19<40> 31×73×97×149×12197×3001187205…93<28>
17 Fully factored 43 3037243898…20<43> 28×5×13×1069×3447817786…13<13>×4952270236…39<23>
18 Composite 54 1625515384…15<54> 5×31×6833×35923×4272434043…07<43>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (43 digits) of term #18:
4272434043335494080136605115658339076357107
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 '1570' --type 38 --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":"1570"},"type":38,"part":"last20","fr":0}}'