A261794 a(n) is the smallest nonzero number that is not a substring of n in decimal representation.

1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1

Offset

0,2

Comments

A261795(n) = a(A261793(n)).

Links

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

Prog

(Haskell)
import Data.List (isInfixOf)
a261794 x = f $ tail a031298_tabf where
   f (cs:css) = if isInfixOf cs (a031298_row x)
                   then f css else foldr (\d v -> 10 * v + d) 0 cs

Crossrefs

Cf. A007089, A031298, A261795, A261793, A261461, A261787.

Sequence in context: A031286 A031276 A305080 * A328929 A098744 A337584

Adjacent sequences: A261791 A261792 A261793 * A261795 A261796 A261797

Keyword

nonn,base

Author

Reinhard Zumkeller, Sep 01 2015

Extensions

Name corrected by Álvar Ibeas, Sep 08 2020

Status

approved