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Integer radii of the spheres around (0,0,0) that contain record numbers of lattice points.
2

%I #11 Jul 10 2017 02:33:24

%S 1,2,3,3,4,6,7,9,10,11,13,14,17,18,19,22,25,26,27,29,30,31,34,34,34,

%T 36,37,41,43,44,47,52,55,56,59,59,60,66,66,70,74,75,80,86,89,90,91,94,

%U 100,103,104,109,115,115,119,125,134,141,146,153,153,157,168,171

%N Integer radii of the spheres around (0,0,0) that contain record numbers of lattice points.

%C Multiple entries indicate that there is more than one covered sphere with an increase in the number of hit lattice points within a radius difference of 1.

%F a(n) = ceiling(A071609(n)^(1/2)).

%Y Cf. A071342, A071343, A071344, A071609, A071611.

%K nonn

%O 1,2

%A _Hugo Pfoertner_, May 25 2002