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%I #3 Mar 30 2012 17:29:16
%S 3,13,44,140,446,1413,4471,14141,44720,141420,447213,1414213,4472135,
%T 14142135,44721359,141421355,447213594,1414213561,4472135954,
%U 14142135623,44721359549,141421356236,447213595499,1414213562372
%N Index of largest triangular number with n digits.
%C Partial sums of A068094.
%F a(n) = A068092(n+1) - 1.
%Y Cf. A068092, A068093, A068094, A095864, A095865, A095866.
%K base,easy,nonn
%O 1,1
%A _Ray Chandler_, Jun 28 2004
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