A028794 Nonsquares mod 81.

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

Links

Table of n, a(n) for n=1..50.

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

Adjacent sequences: A028791 A028792 A028793 * A028795 A028796 A028797

Keyword

nonn,fini,full,easy

Author

N. J. A. Sloane

Status

approved