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A010403
Squares mod 42.
1
0, 1, 4, 7, 9, 15, 16, 18, 21, 22, 25, 28, 30, 36, 37, 39
OFFSET
1,3
MATHEMATICA
Union[PowerMod[Range[42], 2, 42]] (* Alonso del Arte, Dec 21 2019 *)
PROG
(Sage) [quadratic_residues(42)] # Zerinvary Lajos, May 24 2009
(Scala) (1 to 42).map(n => (n * n) % 42).toSet.toSeq.sorted // Alonso del Arte, Dec 21 2019
CROSSREFS
Cf. A028755.
Sequence in context: A282058 A210497 A010383 * A032709 A243172 A370523
KEYWORD
nonn,fini,full,easy
STATUS
approved