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A028794
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Nonsquares mod 81.
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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, 27, 29, 30, 32, 33, 35, 38, 39, 41, 42, 44, 45, 47, 48, 50, 51, 53, 54, 56, 57, 59, 60, 62, 65, 66, 68, 69, 71, 72, 74, 75, 77, 78, 80
(list;
graph;
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..50.
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MATHEMATICA
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Complement[Range[0, 80], PowerMod[Range[81], 2, 81]] (* Alonso del Arte, Dec 27 2019 *)
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PROG
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(Scala) (0 to 80).diff((1 to 81).map(n => (n * n) % 81)) // Alonso del Arte, Dec 27 2019
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CROSSREFS
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Cf. A010442.
Sequence in context: A028806 A028731 A028740 * A028966 A028767 A268226
Adjacent sequences: A028791 A028792 A028793 * A028795 A028796 A028797
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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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