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 A028785 Nonsquares mod 72. 0
 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 29, 30, 31, 32, 33, 34, 35, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE x^2 = 27 mod 72 has no solutions, so 27 is in the sequence. x^2 = 28 mod 72 has the following solutions: x = 10, x = 26, x = 46, x = 62. So 28 is not in the sequence. MATHEMATICA Complement[Range[71], PowerMod[Range[71], 2, 72]] (* Alonso del Arte, Jan 14 2017 *) CROSSREFS Sequence in context: A000037 A028761 A028809 * A166546 A167759 A028812 Adjacent sequences:  A028782 A028783 A028784 * A028786 A028787 A028788 KEYWORD nonn,fini,full AUTHOR STATUS approved

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