http://www.research.att.com/projects/OEIS?Anum=A004210 "Magic Integers" 1,3,8,18,30,43,67,90,122,161,202,260,305,388,416,450,555,... cites "On the Generation of 'Magic Integrals'", J.V. Silverton, Acta Crystallog., A34 (1978), circa p. 634. but gives no definition. Does anyone have any idea how these are defined? Best, -Eric