A261787 - OEIS

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A261787

a(n) is the smallest nonzero number that is not a substring of n in ternary representation.

1, 2, 1, 2, 2, 3, 1, 3, 1, 2, 2, 4, 2, 2, 3, 3, 3, 3, 1, 3, 1, 4, 3, 3, 1, 3, 1, 2, 2, 4, 2, 2, 4, 4, 4, 4, 2, 2, 5, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 3, 3, 3, 3, 3, 1, 3, 1, 4, 3, 3, 1, 3, 1, 4, 4, 4, 5, 3, 3, 3, 3, 3, 1, 3, 1, 4, 3, 3, 1, 3, 1, 2, 2, 4, 2, 2

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OFFSET

0,2

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

FORMULA

A261789(n) = a(A261786(n)).

PROG

(Haskell)

import Data.List (isInfixOf)

a261787 x = f $ tail a030341_tabf where

f (cs:css) = if isInfixOf cs (a030341_row x)