%I
%S 0,2,4,9,11,13,18,20,22,27,29,31,51,53,60,62,69,71,85,94,101,103,110,
%T 112,141,143,150,152,159,161,168,170,211,220,229,245,267,269,292,299,
%U 301,308,310,317,319,326,348,357,359
%N Let S = triangular numbers; a(0)=0; a(n) = smallest m such that m  a(i) is not in S for any i < n.
%D Related papers: A. Sárközy. On the difference sets of sequences of integers, Acta. Math. Acad. Sci. Hungar. 31(1978), no. 12, 125149; no. 34, 355386; Ann. Univ. Sci. Budapest. Eotvos Sect. Math. 21(1978), 4553.
%D I. Z. Rusza. Difference sets without squares, Periodica Math. Hugarica 15(1984), 205209.
%K nonn
%O 0,2
%A _Jan Kristian Haugland_
