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%I #6 Aug 10 2015 07:33:17
%S 0,1,2,0,3,4,0,5,6,7,0,0,8,9,10,0,11,12,0,0,13,14,15,0,16,17,0,18,19,
%T 20,0,0,0,21,22,23,0,24,25,0,26,27,28,0,0,29,30,31,0,32,33,0,0,0,34,
%U 35,36,0,37,38,0,39,40,41,0,0,42,43,44,0,45,46,0,0,47,48,49,0,50,51,0,52,53,54,0,0,0,0,55,56,57,0,58,59,0,60,61,62
%N Left inverse of A219640: If n = A219640(k) for some k, then a(n) = k, otherwise zero.
%H Antti Karttunen, <a href="/A261094/b261094.txt">Table of n, a(n) for n = 0..10946</a>
%F a(n) = A261092(n) * A261093(n).
%F Other identities. For all n >= 0:
%F a(A219640(n)) = n.
%o (Scheme) (define (A261094 n) (* (A261092 n) (A261093 n)))
%Y Cf. A219640, A261092, A261093.
%K nonn
%O 0,3
%A _Antti Karttunen_, Aug 08 2015
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