Search: id:A037048
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%I A037048
%S A037048 0,3,9,20,33,54,77,108,142,186,228,285,342,409,481,563,644,742,837,946,
%T A037048 1060,1184,1308,1449,1592,1744,1903,2076,2240,2432,2618,2818,3028,3246,
%U A037048 3461,3702,3940,4192,4444,4719,4980,5274,5559
%N A037048 Number of pairs {i,j}, i>1, j>1, such that ij < n^2.
%F A037048 Sum(floor((n^2-1)/i)+1-i, i=2..n)
%e A037048 f(3)=3 because the only pairs of 2 numbers > 1 that are < 9 are (2,2) 
               (2,3) (2,4).
%Y A037048 Cf. A034806, A037092.
%Y A037048 Sequence in context: A164283 A033315 A073716 this_sequence A139142 A037257 
               A145068
%Y A037048 Adjacent sequences: A037045 A037046 A037047 this_sequence A037049 A037050 
               A037051
%K A037048 nonn
%O A037048 2,2
%A A037048 Joe K. Crump (joecr(AT)carolina.rr.com)

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