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 A072166 #2 Mar 30 2012 17:30:44
%S A072166 1,3,5,7,10,13,17,21,25,29,31,36,41,46,51,55,61,67,73,79,85,92,99,106,
%T A072166 113,120,127,134,137,145,153,161,169,177,185,193,199,208,217,226,235,
%U A072166 244,253,262,271,281,291,301,311,321,331,341,351,361,371,375,386,397
%N A072166 Triangle in which first row is {1}; to get n-th row take first n numbers greater than last number in previous row which are congruent to 1 (mod n).
%t A072166 a = {1}; k = 2; Do[i = 1; While[i < n + 1, If[ Mod[k, n] == 1, a = Append[a, k]; i++ ]; k++ ], {n, 2, 11}]; a
%Y A072166 Cf. A071977 & A072467.
%K A072166 nonn
%O A072166 1,2
%A A072166 _Robert G. Wilson v_, Jun 28 2002