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A234017 Inverse function for injection A055938. 19


%S 0,0,1,0,0,2,3,0,0,4,0,0,5,6,7,0,0,8,0,0,9,10,0,0,11,0,0,12,13,14,15,

%T 0,0,16,0,0,17,18,0,0,19,0,0,20,21,22,0,0,23,0,0,24,25,0,0,26,0,0,27,

%U 28,29,30,31,0,0,32,0,0,33,34,0,0,35,0,0,36,37,38

%N Inverse function for injection A055938.

%C a(0)=0; thereafter if n occurs as a term of A055938, a(n)=its position in A055938, otherwise zero. This works as an "inverse" function for A055938 in a sense that a(A055938(n)) = n for all n.

%C a(n)*A213714(n) = 0 for all n.

%H Antti Karttunen, <a href="/A234017/b234017.txt">Table of n, a(n) for n = 0..8191</a>

%H Indranil Ghosh, <a href="/A234017/a234017.txt">Python program to generate the sequence</a>

%F a(n) = (1-A079559(n)) * A234016(n).

%o (Scheme) (define (A234017 n) (* (- 1 (A079559 n)) (A234016 n)))

%Y Cf. also A079559, A234016, A055938, A213714, A233275, A233277.

%K nonn

%O 0,6

%A _Antti Karttunen_, Dec 18 2013

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Last modified June 20 06:56 EDT 2021. Contains 345157 sequences. (Running on oeis4.)