A010415 Squares mod 54.

0, 1, 4, 7, 9, 10, 13, 16, 19, 22, 25, 27, 28, 31, 34, 36, 37, 40, 43, 46, 49, 52

Offset

1,3

Links

Table of n, a(n) for n=1..22.

Mathematica

Union[PowerMod[Range[54], 2, 54]] (* Alonso del Arte, Dec 27 2019 *)

Prog

(Sage) [quadratic_residues(54)] # Zerinvary Lajos, May 24 2009
(Scala) (1 to 54).map(n => (n * n) % 54).toSet.toSeq.sorted // Alonso del Arte, Dec 27 2019

Crossrefs

Cf. A028767.

Sequence in context: A056991 A242660 A010389 * A010442 A055047 A234429

Adjacent sequences: A010412 A010413 A010414 * A010416 A010417 A010418

Keyword

nonn,fini,full,easy

Author

N. J. A. Sloane

Status

approved