A085200 - OEIS

%I #5 May 18 2024 14:45:57

%S 0,1,0,2,0,3,0,0,0,4,0,6,0,0,0,5,0,7,0,0,0,0,0,8,0,0,0,0,0,0,0,0,0,9,

%T 0,14,0,0,0,11,0,16,0,0,0,0,0,19,0,0,0,0,0,0,0,0,0,10,0,15,0,0,0,12,0,

%U 17,0,0,0,0,0,20,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,13,0,18,0,0,0,0,0,21,0,0,0

%N Inverse function of N -> N injection A071155.

%C a(0)=0 because A071155(0)=0, but a(n) = 0 also for those n which do not occur as values of A071155. All positive natural numbers occur here once.

%Y a(A071155(n)) = n for all n. Cf. A080300.

%K nonn

%O 0,4

%A _Antti Karttunen_, Jun 23 2003