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%I #17 Jun 24 2022 04:41:25
%S 0,1,4,8,13,22,30,41,54,67,83,98,117,139,160,183,206,234,263,292,322,
%T 357,390,424,461,502,545,585,626,673,719,770,819,870,926,977,1034,
%U 1090,1153,1214,1272,1339,1404,1475,1543,1610,1683,1755,1832,1907,1990,2070,2147
%N Number of lattice points inside circle of radius n is 4(a(n)+n)-3.
%C Number of ordered pairs of integers (x, y) such that x^2+y^2 < n^2 with x, y > 0. - _Arkadiusz Wesolowski_, Nov 13 2017
%D R. K. Guy, Unsolved Problems in Number Theory, F1.
%o (Haskell)
%o a007882 n = length [(x, y) | x <- [1..n], y <- [1..n], x^2 + y^2 < n^2]
%o -- _Arkadiusz Wesolowski_, Nov 12 2017
%K nonn
%O 1,3
%A _Randall L Rathbun_
%E More terms from _Arkadiusz Wesolowski_, Nov 12 2017
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