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 A083506 #8 Aug 23 2014 15:17:10 %S A083506 2,2,3,6,2,3,4,6,8,12,2,3,4,5,6,8,10,12,15,20,2,3,4,5,6,8,10,12,15,18, %T A083506 20,24,30,2,3,4,5,6,7,8,10,12,14,15,18,20,21,24,28,30,35,42,2,3,4,5,6, %U A083506 7,8,10,12,14,15,16,18,20,21,24,28,30,32,35,40,42,48,56,2,3,4,5,6,7,8,9 %N A083506 n-th row of the following triangle contains all distinct numbers that can be obtained as the product of two distinct numbers chosen from 1 to n. (n>1). Sequence contains the triangle read by rows. %D A083506 Amarnath Murthy, Generalization of partition function introducing Smarandache Factor Partitions, Smarandache Notions Journal, 1-2-3, Vol. 11, 2000. %e A083506 2 %e A083506 2,3,6 %e A083506 2,3,4,6,8,12 %e A083506 2,3,4,5,6,8,10,12,15,20 %e A083506 2,3,4,5,6,8,10,12,15,16,18,20,24,30 %e A083506 2,3,4,5,6,7,8,10,12,... %e A083506 ... %Y A083506 A027428 gives the row lengths. %K A083506 nonn,tabf %O A083506 2,1 %A A083506 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 05 2003 %E A083506 More terms from _David Wasserman_, Nov 18 2004