1,3

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

Sequence in context: A024608 A035510 A032778 this_sequence A010403 A032709 A024797

Adjacent sequences: A010380 A010381 A010382 this_sequence A010384 A010385 A010386

nonn,fini,full

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