factordbrpc · fdb
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Inverse home prime · Base 4 of 428 length 39 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
19 Fully factored 19 1807991168…82<19> 2×13×487×346321×412301741
20 Fully factored 20 2833315992…54<20> 2×11×19×6778267923…03<17>
21 Fully factored 21 2776378541…50<21> 2×3×52×11×61×10115533×272694343
22 Fully factored 23 1918915850…10<23> 2×5×7×73×5503×6823944990…27<15>
23 Fully factored 25 2930862056…46<25> 2×3×4884770094…41<24>
24 Fully factored 25 7815632150…70<25> 2×5×7815632150…87<24>
25 Fully factored 26 5002004576…90<26> 2×5×1063×72533×6487467269…81<17>
26 Fully factored 28 4458153560…22<28> 2×41×1787×697988539×4358813900…47<14>
27 Fully factored 29 4907588164…30<29> 2×5×7×103×2801×15427×1575209264…09<18>
28 Fully factored 31 2771137443…78<31> 2×101×6272209×24418171781<11>×89572156691<11>
29 Fully factored 33 1057481376…10<33> 2×32×5×23×5108605683…73<29>
30 Fully factored 34 3347975820…62<34> 2×5849×2862007027…19<30>
31 Fully factored 35 1875644925…82<35> 2×32×7×53015047×2807895433…31<25>
32 Fully factored 36 1929571048…54<36> 2×11×19×661×3987954924…03<14>×1751188079…41<17>
33 Fully factored 37 5168594931…26<37> 2×3×1044613×3319763×2484040889…59<24>
34 Fully factored 38 1747988379…06<38> 2×8739941895…03<37>
35 Fully factored 38 3495976758…14<38> 2×21683×3089131×3390991×7695843162…49<20>
36 Fully factored 39 3549081231…10<39> 2×5×13×37×61403119×1201656752…09<28>
37 Fully factored 40 5284942288…62<40> 2×17×540545527×1047865509…13<14>×2744248960…93<17>
38 Composite 42 1327037369…26<42> 2×42457×1562801622…59<37>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (37 digits) of term #38:
1562801622026368836874495666888119259
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 '428' --type 14 --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":"428"},"type":14,"part":"last20","fr":0}}'