A010380 Squares mod 18.

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

Offset

1,3

Links

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

Mathematica

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

Prog

(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

Crossrefs

Row 18 of A096008.

Cf. A028731.

Sequence in context: A153053 A045752 A266410 * A358348 A056991 A242660

Adjacent sequences: A010377 A010378 A010379 * A010381 A010382 A010383

Keyword

nonn,fini,full

Author

N. J. A. Sloane

Status

approved