%I #8 Sep 02 2013 09:43:44
%S 0,7,35,104,238,482,851,1402,2147,3179,4497,6210,8324,10921,14048,
%T 17759,22146,27247,33158,39953,47652,56372,66135,77187,89351,102902,
%U 117801,134252,152148,171853,193328,216471,241557,268780,298017,329515
%N Number of triples {i,j,k}, i>1, j>1, k>1, such that ijk < n^3.
%F sum(sum(floor((n^3-1)/(ij))-j+1, j=i..floor(sqrt((n^3-1)/i))), i=2..n-1).
%e f(3)=7 because the only triples ijk < 27 are (2,2,2) (2,2,3) (2,2,4) (2,2,5) (2,2,6) (2,3,3) (2,3,4).
%o (PARI) a(n) = sum(i = 2, n-1, sum(j = i, floor(sqrt((n^3-1)/i)), floor((n^3-1)/(i*j))-j+1)); \\ _Michel Marcus_, Sep 02 2013
%Y Cf. A037048.
%K nonn
%O 2,2
%A Joe K. Crump (joecr(AT)carolina.rr.com)