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 A125754 #4 Mar 30 2012 17:21:02 %S A125754 2,4,10,17,18,20,24,36,42,140,145,170,200,292,561,594,660,682,792, %T A125754 1059,1136,1553,1800,2340,2730,4150,4274,4297,4308,4389,4433,4490, %U A125754 4634,4696,4705,4741,4804,4876,5133,5164,5218,5254,5400,5409,5668 %N A125754 Numbers n whose reverse binary representation has the following property: let a 0 mean "halving" and a 1 mean "k -> 3k+1". The number describes an operation k -> f_n(k). If the equation f_n(k) = k has an integer solution, n is a term in the sequence. %C A125754 Suggested by A125626. %C A125754 Note that f_n(x) is always a linear function of x. %H A125754 David Applegate, <a href="/A125754/b125754.txt">Table of n, a(n) for n = 1..101</a> %Y A125754 Cf. A125626, A125755, A125756, A125757, A125710, A125711. %K A125754 nonn %O A125754 1,1 %A A125754 _David Applegate_, Feb 02 2007