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A319290 The y coordinates of the shell enumeration of N X N where N = {0, 1, 2, ...}(A319514).

%I A319290 #7 Sep 23 2018 05:38:11
%S A319290 0,1,1,0,0,1,2,2,2,3,3,3,3,2,1,0,0,1,2,3,4,4,4,4,4,5,5,5,5,5,5,4,3,2,
%T A319290 1,0,0,1,2,3,4,5,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,6,5,4,3,2,1,0,0,1,2,3,
%U A319290 4,5,6,7,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9
%N A319290 The y coordinates of the shell enumeration of N X N where N = {0, 1, 2, ...}(A319514).
%C A319290 See A319514 for comments and references.
%H A319290 Peter Luschny, <a href="/A319290/b319290.txt">Table of n, a(n) for n = 0..10000</a>
%o A319290 (Julia)
%o A319290 function A319290(n)
%o A319290     m = x = isqrt(n)
%o A319290     y = n - x^2
%o A319290     x <= y && ((x, y) = (2x - y, x))
%o A319290     isodd(m) ? x : y
%o A319290 end
%Y A319290 Cf. A319514.
%K A319290 nonn
%O A319290 0,7
%A A319290 _Peter Luschny_, Sep 23 2018