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 A036700 Number of Gaussian integers z=a+bi satisfying |z|<=n, a>=0, 0<=b
 0, 1, 2, 4, 7, 11, 15, 20, 26, 33, 41, 49, 57, 68, 79, 91, 102, 115, 129, 144, 160, 175, 193, 210, 228, 249, 269, 290, 311, 333, 357, 380, 406, 431, 458, 487, 512, 542, 570, 603, 634, 664, 697, 730, 766, 802, 835, 872, 909, 948, 988 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Wikipedia, Gaussian Integers FORMULA Partial sums of A036701. - Sean A. Irvine, Nov 22 2020 MAPLE A036700 := proc(n)         local a, x, y ;         a := 0 ;         for x from 0 do                 if x^2 > n^2 then                         return a;                 fi ;                 for y from 0 to x-1 do                         if y^2+x^2 <= n^2 then                                 a := a+1 ;                         end if;                 end do;         end do: end proc: # R. J. Mathar, Oct 29 2011 CROSSREFS Cf. A036701, A036702. Sequence in context: A247184 A025703 A025709 * A025719 A025696 A077169 Adjacent sequences:  A036697 A036698 A036699 * A036701 A036702 A036703 KEYWORD nonn,changed AUTHOR STATUS approved

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Last modified November 28 11:28 EST 2020. Contains 338720 sequences. (Running on oeis4.)