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 A046038 #15 Feb 16 2025 08:32:38 %S A046038 5,8,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33, %T A046038 34,35,36,37,39,40,41,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58, %U A046038 60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82 %N A046038 Numbers k for which [ (4/3)^k ] is composite. %D A046038 Richard K. Guy, Unsolved Problems in Number Theory, 3rd Edition, Springer, 2004, Section E19, p. 338. %H A046038 Amiram Eldar, <a href="/A046038/b046038.txt">Table of n, a(n) for n = 1..10000</a> %H A046038 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/FloorFunction.html">Floor Function</a>. %t A046038 Select[Range[100],CompositeQ[Floor[(4/3)^#]]&] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Oct 01 2019 *) %Y A046038 Cf. A070762. %K A046038 nonn %O A046038 1,1 %A A046038 _Eric W. Weisstein_