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 A045808 #24 Aug 20 2025 03:13:27
%S A045808 67,69,81,83,167,169,181,183,267,269,281,283,367,369,381,383,467,469,
%T A045808 481,483,567,569,581,583,667,669,681,683,767,769,781,783,867,869,881,
%U A045808 883,967,969,981,983,1067,1069,1081,1083,1167,1169,1181,1183,1267,1269
%N A045808 8-ish numbers (end in 67, 69, 81, 83).
%H A045808 Reinhard Zumkeller, <a href="/A045808/b045808.txt">Table of n, a(n) for n = 1..1000</a>
%F A045808 Empirical g.f.: x*(67+2*x+12*x^2+2*x^3+17*x^4)/(1-x-x^4+x^5). - _Colin Barker_, Jan 23 2012
%t A045808 Select[Range[1300],MemberQ[{67,69,81,83},Mod[#,100]]&] (* _Harvey P. Dale_, Jul 03 2013 *)
%o A045808 (Haskell)
%o A045808 import Data.List (findIndices)
%o A045808 a045808 n = a045808_list !! (n-1)
%o A045808 a045808_list = findIndices (`elem` [67,69,81,83]) $ cycle [0..99]
%o A045808 -- _Reinhard Zumkeller_, Jan 23 2012
%Y A045808 Cf. A045800-A045809.
%Y A045808 Cf. A045572, A045797, A045798.
%K A045808 nonn,base,easy
%O A045808 1,1
%A A045808 _J. H. Conway_
%E A045808 More terms from _Erich Friedman_