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 A115665 #2 Mar 30 2012 17:40:35 %S A115665 4,6,9,15,49,121,143,169,187,221,289,319,323,341,437,493,533,551,559, %T A115665 589,629,667,737,767,781,817,851,871,893,899,913,923,949,961,979,989, %U A115665 1027,1067,1079,1121,1219,1247,1273,1343,1357,1387,1411,1513,1577 %N A115665 Brilliant numbers (A078972) whose digit reversal is a semiprime (A001358). %e A115665 551=19*29 is brilliant and 155=5*31 is semiprime. %Y A115665 Cf. A001358, A078972, A115666. %K A115665 nonn,base %O A115665 1,1 %A A115665 _Giovanni Resta_, Jan 31 2006