FF · Fully factored
★
Interesting number. Smallest 4-perfect number (divisor sum 4n), found by Descartes around 1638 (2^5*3^3*5*7).
Value
30240
Enter a value, an expression, or a term with a variable like 10^n+1 to list a range.
Switch to Database id to look a number up by its stored id.
Reading never stores anything; use Create to add a number to the database.
See the expression syntax & functions reference.
↪
Term #1 of the Inverse home prime · Base 7 sequence of
4319
Term #1 of the Home prime · Base 19 sequence of
22991
Term #1 of the Home prime · Base 31 sequence of
13919
Term #2 of the Aliquot variants · Quasi · σ(n) − n − 1 sequence of
24080
Term #1 of the Aliquot variants · Coreful · s#(n) − n sequence of
18900
Term #1 of the Aliquot variants · Exponential · σ⁽ᵉ⁾(n) − n sequence of
25200
Term #1 of the Inverse home prime · Base 26 sequence of
2326
Term #1 of the Conway climb · Base 19 sequence of
22991
Term #1 of the Conway climb · Base 31 sequence of
13919
Is factor of
From the command linefdb · curl
fdb
fdb number '30240' --detail 2
curl
curl -s 'https://factordb.com:4059/rpc' -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"get_number","params":{"target":{"expr":"30240"},"decimal":false,"detail":2}}'