A010442 Squares mod 81.

0, 1, 4, 7, 9, 10, 13, 16, 19, 22, 25, 28, 31, 34, 36, 37, 40, 43, 46, 49, 52, 55, 58, 61, 63, 64, 67, 70, 73, 76, 79

Offset

1,3

Links

Table of n, a(n) for n=1..31.

Mathematica

Union[PowerMod[Range[81], 2, 81]] (* Alonso del Arte, Dec 27 2019 *)

Prog

(Sage) [quadratic_residues(81)] # Zerinvary Lajos, May 28 2009
(Scala) (1 to 81).map(n => (n * n) % 81).toSet.toSeq.sorted // Alonso del Arte, Dec 27 2019

Crossrefs

Cf. A028794, A055047.

Sequence in context: A242660 A010389 A010415 * A055047 A234429 A291201

Adjacent sequences: A010439 A010440 A010441 * A010443 A010444 A010445

Keyword

nonn,fini,full,easy

Author

N. J. A. Sloane

Status

approved