factordbrpc · fdb
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Inverse home prime · Base 21 of 473 length 21 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
1 Fully factored 3 914 2×457
2 Fully factored 4 9599 29×331
3 Fully factored 6 146000 24×53×73
4 Fully factored 12 131929706456<12> 23×17×487×1991933
5 Fully factored 16 3587647795…63<16> 17×2457073×85890043
6 Fully factored 16 7366455872…53<16> 11×263×295291×8623031
7 Fully factored 18 3261476915…76<18> 22×167×41549×11751066143<11>
8 Fully factored 21 4444589220…83<21> 41×2180627×4971258960…69<13>
9 Fully factored 22 8953677548…77<22> 151×2423×2447209154…49<17>
10 Fully factored 23 9994649353…43<23> 19×7351×10939×228637×286116829
11 Fully factored 26 4419714689…75<26> 52×29×14341×4250859906…83<19>
12 Fully factored 30 1607796764…83<30> 509×1093×4547×6355771156…97<20>
13 Fully factored 32 5048262210…26<32> 2×13×19×6581×1552826967…59<26>
14 Fully factored 34 1331799455…34<34> 2×809×1483×1252021×8299147×5341633590…53<14>
15 Fully factored 38 3369934032…35<38> 5×4264633×3890202754…73<15>×4062538548…43<16>
16 Fully factored 41 5382252831…74<41> 2×37×251×281×299290834169<12>×3445552860…09<23>
17 Fully factored 44 4929100042…89<44> 1052293645…93<13>×4684148821…73<32>
18 Fully factored 45 7813104483…66<45> 2×43×9085005213…31<43>
19 Fully factored 47 8413623327…96<47> 23×114766129×9163878969…53<38>
20 Composite 52 1528524105…48<52> 22×23×3797×9003809×4859791016…03<39>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (39 digits) of term #20:
485979101684455746098575956635180797903
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 '473' --type 71 --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":"473"},"type":71,"part":"last20","fr":0}}'