This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A102744 #8 Mar 29 2015 16:17:03
%S A102744 3,12,37,57,60,70,75,85,89,92,131,147,161,166,177,181,182,194,200,211,
%T A102744 224,228,233,242,244,255,259,260,265,269,271,281,285,293,294,321,325,
%U A102744 329,336,343,364,367,394,402,415,425,435,445,464,465,484,499,522,531
%N A102744 Integers that do not appear in the sequence (A102722) given by the floor of the sum of {n/k} while k=1,...,n. Here {x}:=x-[x].
%t A102744 Resto = Function[n, Sum[n/k - Floor[n/k], {k, 1, n}]]; oops = Floor[Map[Resto, Range[1, 10000]]]; Complement[Range[Max[oops]], Union[oops]]
%t A102744 f[n_] := Floor[Plus @@ FractionalPart[n/Range[2, n - 1]]]; t = {}; Do[ a = f[n]; If[ Position[t, a] == {}, AppendTo[t, a]], {n, 1500}]; Take[ Complement[ Range[ Max[ t]], t], 60] (* _Robert G. Wilson v_, Feb 19 2005 *)
%Y A102744 Cf. A103504. This is the complement of A102722.
%K A102744 nonn
%O A102744 1,1
%A A102744 _Carlos Alves_, Feb 08 2005
%E A102744 Edited and corrected by _Robert G. Wilson v_, Feb 19 2005