A010390 Squares mod 28.

0, 1, 4, 8, 9, 16, 21, 25

Offset

1,3

Links

Table of n, a(n) for n=1..8.

Mathematica

Union[PowerMod[Range[28], 2, 28]] (* Alonso del Arte, Nov 28 2019 *)

Prog

(Sage) [quadratic_residues(28)] # Zerinvary Lajos, May 24 2009
(Scala) (1 to 28).map(n => n * n).map(_ % 28).toSet.toSeq.sorted // Alonso del Arte, Nov 28 2019

Crossrefs

Cf. A028741.

Sequence in context: A324278 A119315 A346256 * A003624 A280387 A243180

Adjacent sequences: A010387 A010388 A010389 * A010391 A010392 A010393

Keyword

nonn,fini,full

Author

N. J. A. Sloane

Status

approved