OFFSET

0,4

LINKS

Rémy Sigrist, Table of n, a(n) for n = 0..16384

Rémy Sigrist, PARI program for A331856

FORMULA

EXAMPLE

For n = 6:

- the binary representation of 6 is "110",

- we can split it in 4 ways:

"110" -> "011" -> 3

"1" and "10" -> "1" and "01" -> 5

"11" and "0" -> "11" and "0" -> 6

"1" and "1" and "0" -> "1" and "1" and "0" -> 6

- we have 3 distinct values, the least being 3,

- hence a(6) = 3.

PROG

(PARI) See Links section.

CROSSREFS

KEYWORD

nonn,base

AUTHOR

Rémy Sigrist, Jan 29 2020

STATUS

approved