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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..16.

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 A024797

Adjacent sequences:  A010400 A010401 A010402 * A010404 A010405 A010406

KEYWORD

nonn,fini,full,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified August 2 11:23 EDT 2021. Contains 346422 sequences. (Running on oeis4.)