factordbrpc · fdb
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Home prime · Base 15 of 781 length 16 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 3 781 11×71
1 Fully factored 4 2546 2×19×67
2 Fully factored 6 105592 23×67×197
3 Fully factored 8 24416522 2×13×17×37×1493
4 Fully factored 10 7359988868<10> 22×23×79999879
5 Fully factored 13 1234197265…04<13> 25×72×19×41427137
6 Fully factored 18 9383471240…12<18> 22×157×1494183318…79<16>
7 Fully factored 20 1431965130…54<20> 2×25873×253361×1092234509<10>
8 Fully factored 21 2474068050…59<21> 17×1063×31038817×441087037
9 Fully factored 23 2558972271…12<23> 23×12854735797<11>×248835556787<12>
10 Fully factored 26 1069257098…62<26> 2×11×83717×150684467×38528075639<11>
11 Fully factored 28 3075797732…14<28> 2×19×47×491×59101595389<11>×59346569701<11>
12 Fully factored 33 1184808894…01<33> 23×13187×404123×9666313929…87<21>
13 Fully factored 34 1321547985…12<34> 24×463×761×2213×4111×74702983×344929605521<12>
14 Fully factored 40 1386769978…46<40> 2×112507×6163038649…89<34>
15 Composite 41 2085302333…64<41> 22×7×7447508335…63<39>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (39 digits) of term #15:
744750833515801270793132623220302915663
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 '781' --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":"781"},"type":33,"part":"last20","fr":0}}'