A010380 Squares mod 18.

0, 1, 4, 7, 9, 10, 13, 16

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• fini
• full

Crossrefs

Row 18 of A096008.

Cf. A028731.

Programs

Mathematica

Union[PowerMod[Range[18], 2, 18]] (* Alonso del Arte, Dec 18 2019 *)

Sage

[quadratic_residues(18)] # Zerinvary Lajos, May 24 2009

Scala

(1 to 18).map(n => (n * n) % 18).toSet.toSeq.sorted // Alonso del Arte, Dec 18 2019