factordbrpc · fdb
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Home prime · Base 15 of 390 length 23 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
3 Fully factored 9 366123964 22×91530991
4 Fully factored 10 5559030991<10> 17×83×3939781
5 Fully factored 11 44518502281<11> 11×73×421×131687
6 Fully factored 13 6530565141…62<13> 2×443×7370841017<10>
7 Fully factored 15 2765304548…92<15> 24×31×557521078277<12>
8 Fully factored 18 9383439493…52<18> 22×163×5419373×265561687
9 Fully factored 21 2149614035…87<21> 31×557×9288271×1340320691<10>
10 Fully factored 22 3070594150…16<22> 25×112×71×1116937110…43<17>
11 Fully factored 27 1603258250…68<27> 25×7×19×26987×1395877333…19<19>
12 Fully factored 33 1217470741…94<33> 2×132×17×29×7306256476…41<27>
13 Fully factored 35 3738868063…41<35> 1871×204973×1294517112…87<13>×7531160430…21<14>
14 Fully factored 37 1594746621…46<37> 2×125441×1398091×7832983×5804429808…01<18>
15 Fully factored 40 1401223952…26<40> 2×1229×12269×39019×103553×456791×2517445915…49<17>
16 Fully factored 42 3442563394…74<42> 2×7×19×1294196765…39<40>
17 Fully factored 44 8099981788…39<44> 2741×2955119222…79<41>
18 Fully factored 45 3991491942…54<45> 2×131×1523470206…17<43>
19 Fully factored 46 1270522991…42<46> 2×112×31×1153×1237×4597×52169263×511871363×9672893883…77<15>
20 Fully factored 50 6923430281…77<50> 61×866567857×1309751523…01<40>
21 Fully factored 52 1526030979…51<52> 7×2153×3780473×3733808321<10>×7173368154…57<31>
22 Composite 54 6413390604…07<54> 23×29×46371792457<11>×2073518783…53<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 #22:
20735187833453542579761118230031186941853
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 '390' --type 33 --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":"390"},"type":33,"part":"last20","fr":0}}'