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 A073144 #5 Mar 30 2012 17:27:38 %S A073144 0,1012,10001145,100000114412,100010505595 %N A073144 Smallest m such that the 'Reverse and Subtract' trajectory (cf. A072137) of m leads to A073142(n). %C A073144 Presumably a(6) = 1000000011011012. %e A073144 1012 -> 1089 -> 8712 -> 6534 -> 2178 = A073142(1) and no m < 1012 leads to 2178. %Y A073144 Cf. A072137, A072141, A072142, A072143, A072718, A072719, A073142, A073143. %K A073144 base,more,nonn %O A073144 1,2 %A A073144 _Klaus Brockhaus_, Jul 17 2002 %E A073144 Offset changed by _N. J. A. Sloane_, Dec 01 2007