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 A173517 a(n) = k if n is the k-th nonsquare, zero otherwise. 4
 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, 23, 24, 25, 26, 27, 28, 29, 30, 0, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 0, 43, 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS a(A000037(n)) = n; a(A000290(n)) = 0. a(n)*A037213(n) = 0 for all n. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..1000 FORMULA a(n) = (1 - A010052(n))*A028391(n). PROG (Haskell) a173517 n = (1 - a010052 n) * a028391 n -- Reinhard Zumkeller, Dec 15 2013 (PARI) a(n)=if(issquare(n), 0, n-sqrtint(n)) \\ Charles R Greathouse IV, Sep 02 2015 CROSSREFS Cf. A000037, A000196, A000290, A010052, A028391, A037213. Sequence in context: A278029 A066246 A198370 * A109921 A139637 A307734 Adjacent sequences:  A173514 A173515 A173516 * A173518 A173519 A173520 KEYWORD nonn,easy AUTHOR Reinhard Zumkeller, Feb 20 2010 EXTENSIONS Definition revised by Reinhard Zumkeller, Dec 15 2013, at the suggestion of Antti Karttunen, who further edited the name STATUS approved

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Last modified October 23 07:11 EDT 2019. Contains 328336 sequences. (Running on oeis4.)