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A028794
Nonsquares mod 81.
1
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
OFFSET
1,1
MATHEMATICA
Complement[Range[0, 80], PowerMod[Range[81], 2, 81]] (* Alonso del Arte, Dec 27 2019 *)
PROG
(Scala) (0 to 80).diff((1 to 81).map(n => (n * n) % 81)) // Alonso del Arte, Dec 27 2019
CROSSREFS
Cf. A010442.
Sequence in context: A351807 A028731 A028740 * A028966 A028767 A268226
KEYWORD
nonn,fini,full,easy
STATUS
approved