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 A225674 #4 May 13 2013 01:28:06 %S A225674 3,28,45,136,153,171,325,351,496,1431,3321,4753,7381,8128,13203,29161, %T A225674 31375,32896,56953,65341,118341,166753,195625,354061,780625,1063611, %U A225674 2390391,2883601,3544453,5649841,6060421,6835753,6924781,9563751,11527201,12708361,19478161,24231241 %N A225674 Triangular numbers of the form p*w, where p is a prime number and w is a prime power (A025475). %Y A225674 Cf. A000040, A000217, A025475. %K A225674 nonn %O A225674 1,1 %A A225674 _Alex Ratushnyak_, May 12 2013