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 A176693 Union of squares and the even numbers. 1
 0, 1, 2, 4, 6, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 25, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 49, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 121, 122 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS MATHEMATICA With[{upto=150}, Union[Join[Range[0, upto, 2], Range[Sqrt[upto]]^2]]] (* Harvey P. Dale, Apr 29 2015 *) PROG (PARI) is_A176693(n)=!bittest(n, 0)||issquare(n) \\ M. F. Hasler, Apr 19 2015 CROSSREFS Cf. A128201 (Union of squares and the odd numbers). Sequence in context: A247423 A182339 A110262 * A118672 A100417 A070089 Adjacent sequences:  A176690 A176691 A176692 * A176694 A176695 A176696 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Apr 24 2010 EXTENSIONS Initial a(1)=0 added by M. F. Hasler, Apr 20 2015 STATUS approved

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