%I A046109
%S A046109 1,4,4,4,4,12,4,4,4,4,12,4,4,12,4,12,4,12,4,4,12,4,4,4,4,20,12,4,4,12,
%T A046109 12,4,4,4,12,12,4,12,4,12,12,12,4,4,4,12,4,4,4,4,20,12,12,12,4,12,4,4,
%U A046109 12,4,12,12,4,4,4,36,4,4,12,4,12,4,4,12,12,20,4,4,12,4,12,4,12,4,4,36
%N A046109 Number of lattice points (x,y) on the circumference of a circle of radius 
               n with center at (0,0).
%H A046109 Michael Gilleland, <a href="selfsimilar.html">Some Self-Similar Integer 
               Sequences</a>
%H A046109 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CircleLatticePoints.html">Link to a section of The World of Mathematics.</
               a>
%F A046109 8*A046080(n) + 4 = a(n) for n > 0.
%Y A046109 Cf. A046110-A046112. Also A000328=A051132+A046109.
%Y A046109 a(n) = A004018(n^2).
%Y A046109 Sequence in context: A053187 A013189 A035621 this_sequence A107680 A134660 
               A132383
%Y A046109 Adjacent sequences: A046106 A046107 A046108 this_sequence A046110 A046111 
               A046112
%K A046109 nonn,easy,nice
%O A046109 0,2
%A A046109 Eric Weisstein (eric(AT)weisstein.com)