factordbrpc · fdb
Sign in
Show
Open
Home prime · Base 21 of 386 length 22 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
2 Fully factored 5 48553 23×2111
3 Fully factored 6 215114 2×59×1823
4 Fully factored 7 8716424 23×592×313
5 Fully factored 11 79430928757<11> 53×1498696769<10>
6 Fully factored 11 96956389442<11> 2×11×17×11003×23561
7 Fully factored 14 4274197097…34<14> 2×19×41×27433870973<11>
8 Fully factored 16 1019050910…35<16> 5×23×66103×134053103
9 Fully factored 18 7805373286…14<18> 2×31×40496987×310870331
10 Fully factored 21 1411062195…91<21> 19776973×7134874459…67<13>
11 Fully factored 21 3298775628…40<21> 26×5×1030867384…27<19>
12 Fully factored 27 5842587122…44<27> 22×13×2277168893<10>×4934084819…29<16>
13 Fully factored 30 2607074188…79<30> 19×1372144309…41<29>
14 Fully factored 31 2344913663…20<31> 22×5×1172456831…41<30>
15 Fully factored 33 1141002758…30<33> 2×5×83×541×1409×4452727×4050179532…47<17>
16 Fully factored 38 2364589016…14<38> 2×31×179×64667×3294793751…79<29>
17 Fully factored 40 9611793271…78<40> 2×857281×287266603831<12>×1951488908…49<23>
18 Fully factored 42 2153635160…63<42> 163×23747627×5563707754…63<32>
19 Fully factored 44 1591192970…13<44> 47×4389821×1655908051…73<16>×4657383111…63<20>
20 Fully factored 46 2022121651…64<46> 22×2545651×3585977×5537846646…83<32>
21 Composite 48 8457403975…55<48> 5×1691480795…71<48>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (48 digits) of term #21:
169148079505374012582301257543816069928487863271
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 '386' --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":"386"},"type":38,"part":"last20","fr":0}}'