%I #11 Jul 14 2024 03:49:10
%S 0,1,1,5,5,25,25,25,25,65,65,65,65,65,65,65,65,65,65,325,325,325,325,
%T 325,325,325,325,325,325,325,325,325,325,325,1105,1105,1105,1105,1105,
%U 1105,1105,1105,1105,1105,1105,1105,1105,1105,1105,1105,1105,1105,1105
%N a(n) = least positive r <= n such that the origin-centered circle of radius sqrt(r) touches A071339(n) lattice points.
%H Hugo Pfoertner, <a href="https://www.randomwalk.de/sequences/a071340.gif">Illustration</a>
%e a(4)=5 because the smallest circle to touch A071339(4)=8 points has radius sqrt(5).
%o (FORTRAN) See A071339.
%Y Cf. A071339-A071347.
%K easy,nonn
%O 0,4
%A _Hugo Pfoertner_, May 22 2002
%E Edited by _Don Reble_, Nov 06 2005