factordbrpc · fdb
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Home prime · Base 31 of 261 length 20 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 3 261 32×29
1 Fully factored 4 3005 5×601
2 Fully factored 4 5406 2×3×17×53
3 Fully factored 7 1952805 3×5×211×617
4 Fully factored 8 90708446 2×953×47591
5 Fully factored 10 2655170466<10> 2×3×13×17×19×105389
6 Fully factored 13 1800361812…23<13> 79×2011×11332367
7 Fully factored 14 6743597651…67<14> 1297×36791×1413221
8 Fully factored 17 3429324323…49<17> 41×131×154643×41287933
9 Fully factored 20 3240168268…48<20> 22×13757×5888217396…91<15>
10 Fully factored 22 1573999178…72<22> 23×2927×3055901×21996445717<11>
11 Fully factored 26 4660431588…61<26> 11×23×479×1877×109030433×1879135483<10>
12 Fully factored 30 2548039991…76<30> 24×49411×3223017131…51<24>
13 Fully factored 35 4136083522…10<35> 2×5×1039×4839871×4172365583<10>×1971322196…23<15>
14 Fully factored 40 1289267974…83<40> 32×107×5717×2341794143…73<33>
15 Fully factored 43 1776402103…23<43> 977×1818221191…99<40>
16 Fully factored 44 1805942939…46<44> 2×3×109×613×15690859×68014231×4221038267…87<23>
17 Fully factored 49 1111443704…94<49> 2×89×149×752019511×5572525840…57<35>
18 Fully factored 52 1064191893…08<52> 28×7×59×191×9631×5471736551…41<40>
19 Composite 63 8963168808…15<63> 3×5×23×83299×3643123983…39<17>×8561083669…47<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 #19:
856108366933630530827110669113162928747
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 '261' --type 48 --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":"261"},"type":48,"part":"last20","fr":0}}'