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 A123481 #25 Jul 21 2017 15:36:56 %S A123481 2,3,7,9,27,230631,626331,837799,1723519,3732423,6649279,8400511, %T A123481 63728127,3743559068799,100759293214567,104899295810901231 %N A123481 Record n for the sequence A006666(n)/log(n), for n > 1; i.e., the n at which the number of steps to 1 for the halving-Collatz iteration divided by log(n) sets a new maximum. %C A123481 These numbers (for n > 2, at least) are called "Abby-Normal" numbers by Dominici in the referenced paper (definition 21); 2 is included here to agree with the RECORDS transform convention. - _D. S. McNeil_, Mar 26 2009 %C A123481 Three further terms are known (see Roosendaal) but they may not be the next three terms. - _N. J. A. Sloane_, Oct 21 2012 %H A123481 D. Dominici, <a href="http://arXiv.org/abs/0704.1057">Working with 2s and 3s</a>, arXiv:0704.1057 %H A123481 Eric Roosendaal, <a href="http://www.ericr.nl/wondrous/comprecs.html">3x+1 Completeness and Gamma Records</a> - From _N. J. A. Sloane_, Oct 21 2012 %K A123481 nonn %O A123481 1,1 %A A123481 Diego Dominici (dominicd(AT)newpaltz.edu), Apr 16 2007 %E A123481 Definition edited by _D. S. McNeil_, Mar 26 2009 %E A123481 Extended by _D. S. McNeil_, Mar 26 2009 %E A123481 a(13) from _Donovan Johnson_, Feb 16 2011 %E A123481 a(14)-a(16) from Roosendaal's table added by _N. J. A. Sloane_, Oct 21 2012