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 A166399 #12 Jun 13 2021 08:24:46 %S A166399 247,1083,1235,1558,2470,2622,2793,2945,3078,4142,4465,4617,4788,5852, %T A166399 6137,7201,7372,7524,7695,7847,8911,9044,9367,9519,10830,11115,11286, %U A166399 11438,12350,12502,12673,12825,12996,14022,14193,14345,14668,15580,15732 %N A166399 Multiples of 19 whose digit reversal - 1 is also a multiple of 19. %H A166399 G. C. Greubel, <a href="/A166399/b166399.txt">Table of n, a(n) for n = 1..10000</a> %t A166399 Select[19 Range[5!], Divisible[FromDigits[Reverse[IntegerDigits[#]]] - 1, 19] &] (* _G. C. Greubel_, May 12 2016 *) %Y A166399 Subsequence of A008601. %K A166399 nonn,base %O A166399 1,1 %A A166399 _Claudio Meller_, Oct 13 2009 %E A166399 Keyword:base added by _R. J. Mathar_, Oct 16 2009