factordbrpc · fdb
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Home prime · Base 33 of 21 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 5 25144 23×7×449
4 Fully factored 8 80722574 2×31×443×2939
5 Fully factored 10 3812056151<10> 107×35626693
6 Fully factored 10 4223113744<10> 24×79×113×29567
7 Fully factored 16 3158882089…35<16> 5×12323×51268069289<11>
8 Fully factored 18 2700417572…17<18> 19×631×1903073×11835661
9 Fully factored 20 3265640160…28<20> 23×523×7805067304…17<16>
10 Fully factored 24 1236470763…06<24> 2×19×277×1174682466…31<20>
11 Fully factored 25 5110068292…77<25> 10513×4860713680…29<21>
12 Fully factored 26 1909558104…06<26> 2×53×251×7177170954…51<21>
13 Fully factored 28 4413341601…41<28> 47×1879×14875456927<11>×3359484109…91<13>
14 Fully factored 31 3344611471…80<31> 22×5×263×6358576941…13<27>
15 Fully factored 34 5276123333…29<34> 4019×62969×167449×5809949×2142965888…39<14>
16 Fully factored 38 1026668934…69<38> 19×49069×1101208646…79<32>
17 Fully factored 40 1748021761…23<40> 17×23×4363×764783×1339820563…57<28>
18 Fully factored 41 5362306487…23<41> 101×2097432820…91<20>×2531291726…53<20>
19 Fully factored 42 3071279317…05<42> 5×17×1367761×3234480239…83<14>×8167434701…31<20>
20 Fully factored 45 6005443621…57<45> 6974717125…81<13>×8610304207…97<32>
21 Fully factored 47 1781694649…06<47> 2×655657×1358709393…79<41>
22 Composite 48 3026637471…02<48> 2×13×59473×1957344232…49<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 #22:
195734423206557200357176519967413546826249
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 '21' --type 50 --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":"21"},"type":50,"part":"last20","fr":0}}'