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A010390 Squares mod 28. 1
0, 1, 4, 8, 9, 16, 21, 25 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Table of n, a(n) for n=1..8.
MATHEMATICA
Union[PowerMod[Range[28], 2, 28]] (* Alonso del Arte, Nov 28 2019 *)
PROG
(Sage) [quadratic_residues(28)] # Zerinvary Lajos, May 24 2009
(Scala) (1 to 28).map(n => n * n).map(_ % 28).toSet.toSeq.sorted // Alonso del Arte, Nov 28 2019
CROSSREFS
Cf. A028741.
Sequence in context: A324278 A119315 A346256 * A003624 A280387 A243180
Adjacent sequences: A010387 A010388 A010389 * A010391 A010392 A010393
KEYWORD
nonn,fini,full
AUTHOR
N. J. A. Sloane
STATUS
approved

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Last modified May 13 18:50 EDT 2024. Contains 372522 sequences. (Running on oeis4.)