%I #3 May 30 2012 11:26:17
%S 9,11,14,20,24,27,28,40,45,48,54
%N Numbers n such that A212813(n) = 2.
%D Bellamy, O. S.; Cadogan, C. C. Subsets of positive integers: their cardinality and maximality properties. Proceedings of the Tenth Southeastern Conference on Combinatorics, Graph Theory and Computing (Florida Atlantic Univ., Boca Raton, Fla., 1979), pp. 167--178, Congress. Numer., XXIII-XXIV, Utilitas Math., Winnipeg, Man., 1979. MR0561043 (82b:10006)
%Y Cf. A212813, A212814, A212815.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, May 30 2012