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Numbers n such that binomial(n,2) is in A027568.
4

%I #5 Mar 30 2012 16:50:10

%S 1,2,5,16,56,120

%N Numbers n such that binomial(n,2) is in A027568.

%Y Cf. A027568.

%K nonn,fini,full

%O 1,2

%A _N. J. A. Sloane_, Sep 06 2008