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 A172470 #12 Mar 30 2012 17:30:05 %S A172470 9,52,9,61,61,9,52,9,61,61,61,9,52,9,61,61,9,52,9,61,61,61,9,52,9,61, %T A172470 61,9,52,9,52,9,61,61,9,52,9,61,61,61,9,52,9,61,61,9,52,9,61,61,61,9, %U A172470 52,9,61,61,9,52,9,61,61,61,9,52,9,61,61,9,52,9,52,9,61,61,9,52,9,61,61,61,9 %N A172470 First differences of A172468. %C A172470 The numbers in the sequence are conjectured to be restricted to 9,52, or 61. Note that 61-52 = 9, (52+2)/(61-52) = (52+2)/9 = 6, (61+2)/(61-52) = (61+2)/9 = 7 and we have lcm(9,52,61) =28548 = 13^4 - 13 and (52+2)/9 + (61+2)/9 = 6+7 = 13. %H A172470 Stephen Crowley, <a href="http://vixra.org/abs/1203.0004">A Mysterious Three Term Integer Sequence Related to a Lambert W Function Solution to a Certain Transcendental Equation</a> %F A172470 a(n) = A172468(n+1) - A172468(n). %Y A172470 Cf. A172468, A167389. %K A172470 nonn %O A172470 1,1 %A A172470 _Stephen Crowley_, Feb 04 2010