The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #6 Nov 04 2013 11:58:54
%S 0,3,6,8,9,11,12,15,17,18,19,20,21,22,24,25,27,29,30,31,32,33,34,35,
%T 36,37,39,41,43,44,45,46,47,48,49,50,51,53,54,55,56,57,59,60,61,62,63,
%U 65,66,67,68,69,70,71,72,73,75,76,77,78,79,80,81,82,83,84,85,86
%N Squared distances that can arise in any Barlow packing of spheres of diameter sqrt(3) (the scale being the simplest one that makes this an integer sequence).
%F The set of all values of N = xx + xy + yy + 2zz for which x, y, z are integers subject to the proviso that N must be a multiple of 3 if |z| < 2.
%Y Complement of A036559.
%K nonn
%O 0,2
%A _J. H. Conway_, _N. J. A. Sloane_.