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A261922 a(n) = smallest nonnegative number that is not a substring of n in its binary representation. 8

%I

%S 1,0,3,0,3,3,4,0,3,3,3,4,5,4,4,0,3,3,3,5,3,3,4,4,5,5,4,4,5,4,4,0,3,3,

%T 3,5,3,3,5,5,3,3,3,4,7,4,4,4,5,5,5,5,7,4,4,4,5,5,4,4,5,4,4,0,3,3,3,5,

%U 3,3,5,5,3,3,3,6,5,7,5,5,3,3,3,6,3,3,4,4,7,7,4,4,8,4,4,4,5,5,5,5,5,7

%N a(n) = smallest nonnegative number that is not a substring of n in its binary representation.

%C a(A062289(n))=A261461(A062289(n)); a(A126646(n))!=A261461(A126646(n)). - _Reinhard Zumkeller_, Sep 17 2015

%H Reinhard Zumkeller, <a href="/A261922/b261922.txt">Table of n, a(n) for n = 0..10000</a>

%o (Haskell)

%o import Data.List (isInfixOf)

%o a261922 x = f a030308_tabf where

%o f (cs:css) = if isInfixOf cs (a030308_row x)

%o then f css else foldr (\d v -> 2 * v + d) 0 cs

%o -- _Reinhard Zumkeller_, Sep 17 2015

%Y Similar to A261461.

%Y Cf. A007088, A030308, A062289, A126646, A262281.

%K nonn,base

%O 0,3

%A _N. J. A. Sloane_, Sep 16 2015

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Last modified June 16 19:49 EDT 2021. Contains 345068 sequences. (Running on oeis4.)