factordbrpc · fdb
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Inverse home prime · Base 18 of 398 length 15 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 3 398 2×199
1 Fully factored 4 3584 29×7
2 Fully factored 13 1411851419…78<13> 2×7×43×677×3464207
3 Fully factored 16 2120856991…36<16> 22×22086677×24006067
4 Fully factored 18 2645459190…78<18> 2×1322729595…89<18>
5 Fully factored 19 2380913271…04<19> 22×7×617×5320661×25902089
6 Fully factored 23 2996434958…78<23> 2×197×274163×2773957415…99<15>
7 Fully factored 25 3056890135…88<25> 22×41×1031×37253×1674133×289885243
8 Fully factored 29 3520352808…98<29> 2×8191×480953279×4468033071…41<16>
9 Fully factored 31 5168760869…28<31> 24×121090454227<12>×2667820155…79<19>
10 Fully factored 35 5555192535…74<35> 2×2777596267…87<35>
11 Fully factored 36 4999673282…68<36> 25×151×1034700596…49<33>
12 Fully factored 41 6334644322…38<41> 2×131×8669×15335449×25032067×7265386662…87<20>
13 Fully factored 44 5145603631…76<44> 25×1669×89231×1079727727…37<35>
14 Composite 50 1249062918…62<50> 2×148327913×4210478301…87<41>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (41 digits) of term #14:
42104783015200723199021332136404477902887
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 '398' --type 68 --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":"398"},"type":68,"part":"last20","fr":0}}'