factordbrpc · fdb
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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.

FF · Fully factored
below threshold 4 digits
★
Interesting number. 6601 = 7*23*41, the sixth Carmichael number (Simerka 1885), also a Fibonacci pseudoprime: it divides F(6600).

Value

6601
7×23×41
↪
Term #1 of the Home prime · Base 34 sequence of 4105 · 8 terms
Term #1 of the Aliquot variants · Augmented · σ(n) − n + 1 sequence of 3564 · 2 terms
Term #1 of the Conway climb · Base 34 sequence of 4105 · 15 terms
Term #1 of the Conway climb · Base 36 sequence of 1625 · 3 terms
Term #2 of the Mid-divisor concatenation · Base 2 sequence of 1946 · 4 terms
Term #1 of the Mid-divisor concatenation · Base 8 sequence of 5484 · 2 terms
Term #1 of the Mid-divisor concatenation · Base 10 sequence of 3606 · 3 terms
Is factor of
From the command linefdb · curl
fdb
fdb number '6601' --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":"6601"},"decimal":false,"detail":2}}'