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 A115680 #2 Mar 30 2012 17:40:35 %S A115680 12,51,176,715,925,1426,3151,3290,10795,15251,16172,19097,79235,92132, %T A115680 114955,117460,119992,127750,150575,355510,755795,779401,1010651, %U A115680 1108970,1258126,1274665,1294097,1463722,1466687,1675345,1881040 %N A115680 Pentagonal numbers (A000326) whose digit reversal is a brilliant number (A078972). %e A115680 3151 is the 46th pentagonal number and 1513=17*89 is brilliant. %Y A115680 Cf. A000326, A078972, A115679. %K A115680 nonn,base %O A115680 1,1 %A A115680 _Giovanni Resta_, Jan 31 2006