A010381 Squares mod 19.
0, 1, 4, 5, 6, 7, 9, 11, 16, 17
Offset: 1
Programs
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Mathematica
Union[PowerMod[Range[19], 2, 19]] (* Alonso del Arte, Dec 19 2019 *)
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Sage
[quadratic_residues(19)] # Zerinvary Lajos, May 24 2009
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Scala
(1 to 19).map(n => (n * n) % 19).toSet.toSeq.sorted // Alonso del Arte, Dec 19 2019