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 A036701 a(n)=number of Gaussian integers z=a+bi satisfying n-1<|z|<=n, a>=0, 0<=b
 0, 1, 1, 2, 3, 4, 4, 5, 6, 7, 8, 8, 8, 11, 11, 12, 11, 13, 14, 15, 16, 15, 18, 17, 18, 21, 20, 21, 21, 22, 24, 23, 26, 25, 27, 29, 25, 30, 28, 33, 31, 30, 33, 33, 36, 36, 33, 37, 37, 39, 40, 41, 41, 39, 42, 42, 46, 43, 46, 45, 47 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Robert Israel, Table of n, a(n) for n = 0..2000 MAPLE N:= 100: A:= Array(0..N): for a from 1 to N do   for b from 0 to a-1 do      r:= ceil(sqrt(a^2+b^2));      if r > N then break fi;      A[r]:= A[r]+1; od od: seq(A[i], i=0..N); # Robert Israel, Dec 18 2018 CROSSREFS Cf. A036700. Sequence in context: A244230 A277814 A006162 * A053756 A210436 A003004 Adjacent sequences:  A036698 A036699 A036700 * A036702 A036703 A036704 KEYWORD nonn AUTHOR STATUS approved

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Last modified April 7 15:38 EDT 2020. Contains 333305 sequences. (Running on oeis4.)