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A010383 Squares mod 21. 0
0, 1, 4, 7, 9, 15, 16, 18 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

PROG

(Other) sage: [quadratic_residues(21)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 24 2009]

CROSSREFS

Sequence in context: A035510 A187898 A032778 * A010403 A032709 A024797

Adjacent sequences:  A010380 A010381 A010382 * A010384 A010385 A010386

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.