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 A228014 #19 Jul 16 2021 01:40:07 %S A228014 3,6,7,9,11,14,15,18,19,27,31,41,47,54,55,62,63,71,73,82,83,91,94,95, %T A228014 97,108,109,110 %N A228014 Numbers k whose Collatz sequence length is greater than k+1 (counting both the x/2 and the 3x+1 steps). %H A228014 <a href="/index/3#3x1">Index entries for sequences related to 3x+1 (or Collatz) problem</a> %e A228014 a(1) is 3 because its Collatz sequence has eight steps: 3, 10, 5, 16, 8, 4, 2, 1. %t A228014 Select[Range[1000], Length[Collatz[#]] > #+1 &] (* _T. D. Noe_, Aug 20 2013 *) %Y A228014 Cf. A082984 (allows number of steps equal to n). %K A228014 nonn,more %O A228014 1,1 %A A228014 _Gonzalo Ciruelos_, Aug 02 2013