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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A000548 Squares that are not the sum of 2 nonzero squares. 6 1, 4, 9, 16, 36, 49, 64, 81, 121, 144, 196, 256, 324, 361, 441, 484, 529, 576, 729, 784, 961, 1024, 1089, 1296, 1444, 1764, 1849, 1936, 2116, 2209, 2304, 2401, 2916, 3136, 3249, 3481, 3844, 3969, 4096, 4356, 4489 (list; graph; refs; listen; history; text; internal format) OFFSET 1,2 COMMENTS Squares of nonhypotenuse numbers A004144(n). - Lekraj Beedassy, Jul 06 2004 A143574(a(n)) = a(n); intersection of A000290 and A143575. - Reinhard Zumkeller, Aug 24 2008 LINKS R. Zumkeller, Table of n, a(n) for n = 1..1000 Index entries for sequences related to sums of squares FORMULA A000290 \ A134422. - R. J. Mathar, Feb 06 2011 MATHEMATICA okQ[n_] := n == 1 || AllTrue[FactorInteger[n][[All, 1]], Mod[#, 4] != 1& ]; A000548 = Select[Range[100], okQ]^2 (* Jean-François Alcover, Feb 09 2016 *) CROSSREFS Sequence in context: A014764 A100498 A068952 * A256944 A349062 A106575 Adjacent sequences: A000545 A000546 A000547 * A000549 A000550 A000551 KEYWORD nonn AUTHOR N. J. A. Sloane and J. H. Conway STATUS approved

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Last modified July 18 17:25 EDT 2024. Contains 374388 sequences. (Running on oeis4.)