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%I #6 Jan 30 2024 04:37:25
%S 0,0,0,1,0,0,0,2,3,0,0,0,0,0,0,0,0,4,5,0,6,7,8,0,0,0,0,0,0,0,0,0,0,0,
%T 0,0,0,0,0,0,0,0,0,0,0,9,10,0,11,12,13,0,0,0,14,15,0,16,17,18,0,19,20,
%U 21,22,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N Inverse function of N -> N injection A057548.
%C a(1)=0 because A057548(0)=1, but a(n) = 0 also for those n which do not occur as values of A057548. All positive natural numbers occur here once.
%F a(n) = A083923(n)*A072771(n).
%Y a(A057548(n)) = n for all n. Cf. A083926-A083929, A083935.
%K nonn
%O 0,8
%A _Antti Karttunen_, May 13 2003
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