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 A115678 #4 Feb 21 2013 17:49:00
%S A115678 6,120,946,1540,7021,13366,14365,15400,19306,35245,72010,95266,156520,
%T A115678 179101,191890,334153,341551,913276,925480,933661,946000,1008910,
%U A115678 1030330,1131760,1383616,1945378,3066526,3156328,3308878,3584503
%N A115678 Triangular numbers whose digit reversal is a brilliant number (A078972).
%H A115678 Harvey P. Dale, <a href="/A115678/b115678.txt">Table of n, a(n) for n = 1..1000</a>
%e A115678 946=T(43) and 649=11*59 is brilliant.
%t A115678 bnoQ[n_]:=Module[{f=Transpose[FactorInteger[n]][[1]]},PrimeOmega[n] == 2 && IntegerLength[f[[1]]]==IntegerLength[f[[2]]]]; Select[Accumulate[Range[3000]], bnoQ[FromDigits[Reverse[IntegerDigits[#]]]]&] (* _Harvey P. Dale_, Feb 21 2013 *)
%Y A115678 Cf. A078972, A115677.
%K A115678 nonn,base
%O A115678 1,1
%A A115678 _Giovanni Resta_, Jan 31 2006