A010389 Squares mod 27.

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

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• fini
• full

Crossrefs

Cf. A028740.

Programs

Mathematica

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

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