A010381 Squares mod 19.

0, 1, 4, 5, 6, 7, 9, 11, 16, 17

Offset

1,3

References

Harold Davenport, The Higher Arithmetic, Cambridge University Press, 8th ed., 2008, p. 55.

Links

Table of n, a(n) for n=1..10.

Mathematica

Union[PowerMod[Range[19], 2, 19]] (* Alonso del Arte, Dec 19 2019 *)

Prog

(SageMath) [quadratic_residues(19)] # Zerinvary Lajos, May 24 2009
(Scala) (1 to 19).map(n => (n * n) % 19).toSet.toSeq.sorted // Alonso del Arte, Dec 19 2019

Crossrefs

Row 19 of A096008.

Cf. A028732.

Sequence in context: A260997 A192242 A209321 * A095033 A010399 A215046

Adjacent sequences: A010378 A010379 A010380 * A010382 A010383 A010384

Keyword

nonn,fini,full

Author

N. J. A. Sloane

Status

approved