A010382 Squares mod 20.

0, 1, 4, 5, 9, 16

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• fini
• full
• easy

Comments

Range of A070442. - Reinhard Zumkeller, Apr 24 2009

Crossrefs

Cf. A010378, A010462, A010421. - Reinhard Zumkeller, Apr 24 2009

Row 20 of A096008.

Cf. A028733.

Programs

Mathematica

Union[PowerMod[Range[20], 2, 20]] (* Alonso del Arte, Dec 20 2019 *)

Sage

[quadratic_residues(20)] # Zerinvary Lajos, May 24 2009

Scala

(1 to 20).map(n => (n * n) % 20).toSet.toSeq.sorted // Alonso del Arte, Dec 20 2019