A010462 Squares mod 30.
0, 1, 4, 6, 9, 10, 15, 16, 19, 21, 24, 25
Offset: 1
Examples
3^2 = 9, so 9 is in the sequence. 10^2 and 20^2 are both congruent to 10 mod 30, so 10 is in the sequence. There are no solutions to x^2 = 11 mod 30, so 11 is not in the sequence.
Crossrefs
Programs
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Mathematica
Union[PowerMod[Range[30], 2, 30]] (* Alonso del Arte, Jan 30 2018 *)
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Sage
[quadratic_residues(30)] # Zerinvary Lajos, May 24 2009
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Scala
(1 to 30).map(n => n * n).map( % 30).toSet.toSeq.sorted // _Alonso del Arte, Nov 30 2019
Comments