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A010380
Squares mod 18.
1
0, 1, 4, 7, 9, 10, 13, 16
(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[18], 2, 18]] (* Alonso del Arte, Dec 18 2019 *)
PROG
(Sage) [quadratic_residues(18)] # Zerinvary Lajos, May 24 2009
(Scala) (1 to 18).map(n => (n * n) % 18).toSet.toSeq.sorted // Alonso del Arte, Dec 18 2019
CROSSREFS
Row 18 of A096008.
Cf. A028731.
Sequence in context: A153053 A045752 A266410 * A358348 A056991 A242660
Adjacent sequences: A010377 A010378 A010379 * A010381 A010382 A010383
KEYWORD
nonn,fini,full
AUTHOR
N. J. A. Sloane
STATUS
approved

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Last modified November 27 16:00 EST 2024. Contains 378159 sequences.
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