factordbrpc · fdb
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Mid-divisor concatenation · Base 16 of 28012 length 38 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
18 Fully factored 17 1649043656…93<17> 32×467×3923491925…31<13>
19 Fully factored 17 7394388143…79<17> 27061×2732488874…39<13>
20 Fully factored 18 4760648790…15<18> 32×5×79×131×191×5352071113<10>
21 Fully factored 19 6112573752…93<19> 59×1036029449…27<18>
22 Fully factored 20 6812597171…11<20> 4421×1540962943…91<17>
23 Fully factored 21 3185820328…47<21> 41×55411×5151539×27221023
24 Fully factored 22 1227123083…97<22> 37×299333×1672243×66257099
25 Fully factored 22 2695466679…07<22> 23981×7795859×14417923033<11>
26 Fully factored 23 1585267402…87<23> 19×577×24029×98911×608405071
27 Fully factored 23 4965165368…03<23> 3×23×4451×1616691044…37<18>
28 Fully factored 24 3540842612…81<24> 11×19×34050626171<11>×49754828579<11>
29 Fully factored 24 6017661381…93<24> 3×2207×9871×9207527109…23<16>
30 Fully factored 25 4709388270…99<25> 61×79×1988135419<10>×491543105659<12>
31 Fully factored 25 8647317763…05<25> 5×7×11×974003×2306005794…31<17>
32 Fully factored 26 2702096043…11<26> 3×609359×1478108440…43<20>
33 Fully factored 26 3372208334…75<26> 52×3467×3890635517…17<21>
34 Fully factored 27 4093115039…17<27> 53×97×7961709861…37<23>
35 Fully factored 28 6215167255…53<28> 1301×1372627×802081531×4339148069<10>
36 Fully factored 29 2542386310…61<29> 1111013×2288349740…97<23>
37 Composite 29 8394579173…65<29> 3×5×112×97×4768157208…83<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 #37:
476815720855509092473883
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 '28012' --type 144 --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":"28012"},"type":144,"part":"last20","fr":0}}'