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 A172275 #11 Sep 08 2022 08:45:50
%S A172275 0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,23,
%T A172275 24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,
%U A172275 47,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69
%N A172275 a(n) = floor(n*(sqrt(13)-sqrt(7))).
%H A172275 Vincenzo Librandi, <a href="/A172275/b172275.txt">Table of n, a(n) for n = 0..1000</a>
%t A172275 With[{c = Sqrt[13] - Sqrt[7]}, Floor[c Range[0, 80]]] (* _Harvey P. Dale_, Jan 22 2013 *)
%o A172275 (Magma) [Floor(n*(Sqrt(13)-Sqrt(7))): n in [0..80]]; // _Vincenzo Librandi_, Aug 01 2013
%Y A172275 Cf. A172264, A172266-A172270, A172272-A172278.
%K A172275 nonn,easy
%O A172275 0,4
%A A172275 _Vincenzo Librandi_, Jan 30 2010