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A028767
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Nonsquares mod 54.
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1
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2, 3, 5, 6, 8, 11, 12, 14, 15, 17, 18, 20, 21, 23, 24, 26, 29, 30, 32, 33, 35, 38, 39, 41, 42, 44, 45, 47, 48, 50, 51, 53
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..32.
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MATHEMATICA
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Complement[Range[0, 53], PowerMod[Range[54], 2, 54]] (* Alonso del Arte, Dec 27 2019 *)
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PROG
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(Scala) (0 to 53).diff((1 to 54).map(n => (n * n) % 54)) // Alonso del Arte, Dec 27 2019
(MAGMA) [ n: n in [0..53] | not IsSquare(R! n) where R:= ResidueClassRing(54)]; // Vincenzo Librandi, Dec 28 2019
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CROSSREFS
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Cf. A010415.
Sequence in context: A028740 A028794 A028966 * A268226 A138529 A266409
Adjacent sequences: A028764 A028765 A028766 * A028768 A028769 A028770
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KEYWORD
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nonn,fini,full,easy
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AUTHOR
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N. J. A. Sloane
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STATUS
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approved
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