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 A074805 #7 Aug 27 2015 10:12:28
%S A074805 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,1,2,3,4,5,6,7,8,9,10,
%T A074805 11,12,13,14,15,16,17,18,19,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,
%U A074805 18,19,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,1,2,3,4,5,6,7,8
%N A074805 n mod 19 + 1 ("Golden Number").
%H A074805 Eric Weisstein's World of Astronomy, <a href="http://scienceworld.wolfram.com/astronomy/GoldenNumber.html">Golden Number</a>
%H A074805 <a href="/index/Rec#order_19">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).
%F A074805 a(n) = n mod 19 + 1
%e A074805 a(0) = 0 mod 19 + 1 = 1
%t A074805 LinearRecurrence[{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19},84] (* _Ray Chandler_, Aug 27 2015 *)
%Y A074805 Cf. A064265, A064266, A064263, A064264, A064267.
%K A074805 easy,nonn
%O A074805 0,2
%A A074805 _Jeremy Gardiner_, Sep 08 2002