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 A221563 #13 May 05 2013 14:35:48 %S A221563 120,528,1485,3240,58653,70125,139128,609960,886446,902496,1062153, %T A221563 1844160,4017195,8386560,8759205,38618866,39760903,122062500, %U A221563 160554240,703893960,741105750,797222415,6115239936,10854464130,23667373395,82103447700,131197213890 %N A221563 Triangular numbers representable as t*p, where t>1 is a triangular number, p>1 is a prime power (A025475). %e A221563 Triangular(32) = 528 = 66 * 8, because 66 is a triangular number and 8 is a prime power, 528 is in the sequence. %e A221563 Triangular(54) = 1485 = 55 * 27, because 55 is a triangular number and 27 is a prime power, 1485 is in the sequence. %Y A221563 Cf. A000217, A025475, A029549. %K A221563 nonn %O A221563 1,1 %A A221563 _Alex Ratushnyak_, May 03 2013