factordbrpc · fdb
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Home prime · Base 17 of 142 length 21 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
1 Fully factored 3 649 11×59
2 Fully factored 4 3238 2×1619
3 Fully factored 5 11445 3×5×7×109
4 Fully factored 6 277260 22×3×5×4621
5 Fully factored 8 51394601 19×2704979
6 Fully factored 9 461318790 2×3×5×15377293
7 Fully factored 11 15318596039<11> 59×259637221
8 Fully factored 11 24469618928<11> 24×1867×819149
9 Fully factored 14 7282955937…08<14> 24×137×33225163949<11>
10 Fully factored 18 3578148772…58<18> 2×33×6626201429…77<16>
11 Fully factored 21 1064511263…16<21> 24×32×13×432×3075441747…47<14>
12 Fully factored 27 1468212670…00<27> 24×52×67×5478405485…99<22>
13 Fully factored 32 1226280315…52<32> 22×3×593×1723271944…97<28>
14 Fully factored 35 6034375208…41<35> 11×1663×3209×1027963416…93<28>
15 Fully factored 36 3214623408…36<36> 26×13×25219×797238734219<12>×1921721831…93<17>
16 Fully factored 43 1454194025…88<43> 23×13×19×73×149×134363×310087×1623914036…49<25>
17 Fully factored 49 2066911044…63<49> 3×23×11701379×2559974557…13<40>
18 Fully factored 51 8652357075…06<51> 2×3×13×71×1283×3989×1218714097<10>×5732593775…89<15>×4369560808…47<17>
19 Fully factored 55 3065889495…02<55> 2×1532944747…01<55>
20 Composite 56 4843927507…15<56> 3×5×521×49285617181<11>×1257617156…81<42>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (42 digits) of term #20:
125761715619364116145520690418663386136581
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 '142' --type 34 --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":"142"},"type":34,"part":"last20","fr":0}}'