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 A175072 #2 Mar 30 2012 19:00:23
%S A175072 2,5,7,9,13,15,19,21,25,28,31,33,36,39,43,45,49,52,55,58,61,63,66,69,
%T A175072 73,75,78,81,85,88,91,94,96,99,103,105,109,111,115,118,120,122,126,
%U A175072 129,133,136,139,141,144,146,148,151
%N A175072 Natural numbers m with result 2 under iterations of {r mod (max prime p < r)} starting at r = m.
%C A175072 Complement of A175071.
%C A175072 Union of A175075 and A175076. [From _Jaroslav Krizek_, Jan 30 2010, A-numbers corrected R. J. Mathar, Feb 19 2010]
%e A175072 Iteration procedure for a(6) = 15: 15 mod 13 = 2. Iteration procedure for a(10) = 28: 28 mod 23 = 5, 5 mod 3 = 2.
%K A175072 nonn
%O A175072 1,1
%A A175072 _Jaroslav Krizek_, Jan 23 2010