A010389 Squares mod 27.

0, 1, 4, 7, 9, 10, 13, 16, 19, 22, 25

Offset

1,3

Links

Table of n, a(n) for n=1..11.

Mathematica

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

Prog

(Sage) [quadratic_residues(27)] # Zerinvary Lajos, May 24 2009
(Scala) (1 to 27).map(n => n * n).map(_ % 27).toSet.toSeq.sorted // Alonso del Arte, Nov 27 2019

Crossrefs

Cf. A028740.

Sequence in context: A358348 A056991 A242660 * A010415 A010442 A055047

Adjacent sequences: A010386 A010387 A010388 * A010390 A010391 A010392

Keyword

nonn,fini,full

Author

N. J. A. Sloane

Status

approved