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%I #17 Dec 11 2015 12:34:26
%S 0,0,1,2,0,3,4,5,6,0,7,8,9,10,11,12,0,13,14,15,16,17,18,19,20,0,21,22,
%T 23,24,25,26,27,28,29,30,0,31,32,33,34,35,36,37,38,39,40,41,42,0,43,
%U 44,45,46,47,48,49,50,51,52,53,54,55,56,0,57,58,59,60,61,62,63,64,65,66,67
%N a(n) = k if n is the k-th nonsquare, zero otherwise.
%C a(A000037(n)) = n; a(A000290(n)) = 0.
%C a(n)*A037213(n) = 0 for all n.
%H Reinhard Zumkeller, <a href="/A173517/b173517.txt">Table of n, a(n) for n = 0..1000</a>
%F a(n) = (1 - A010052(n))*A028391(n).
%o (Haskell)
%o a173517 n = (1 - a010052 n) * a028391 n
%o -- _Reinhard Zumkeller_, Dec 15 2013
%o (PARI) a(n)=if(issquare(n), 0, n-sqrtint(n)) \\ _Charles R Greathouse IV_, Sep 02 2015
%Y Cf. A000037, A000196, A000290, A010052, A028391, A037213.
%K nonn,easy
%O 0,4
%A _Reinhard Zumkeller_, Feb 20 2010
%E Definition revised by _Reinhard Zumkeller_, Dec 15 2013, at the suggestion of _Antti Karttunen_, who further edited the name
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