A010382 Squares mod 20.

0, 1, 4, 5, 9, 16

Offset

1,3

Comments

Range of A070442. - Reinhard Zumkeller, Apr 24 2009

Links

Table of n, a(n) for n=1..6.

Mathematica

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

Prog

(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

Crossrefs

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

Row 20 of A096008.

Cf. A028733.

Sequence in context: A251632 A350695 A049860 * A138673 A087948 A010437

Adjacent sequences: A010379 A010380 A010381 * A010383 A010384 A010385

Keyword

nonn,fini,full,easy

Author

N. J. A. Sloane

Status

approved