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 A072144 #4 Mar 30 2012 17:27:35 %S A072144 10001145,10001827,10002179,10002289,10002894,10003037,10003268, %T A072144 10003378,10004412,10004698,10006304,10007624,10007734,10007965, %U A072144 10008108,10008713,10008823,10009175,10009857,10010022,10010484 %N A072144 Numbers n such that the period length of the 'Reverse and Subtract' trajectory of n is greater than 2. %C A072144 'Reverse and Subtract' (cf. A072137) is defined by x -> |x - reverse(x)|. - Subsequence of A072140. %e A072144 10001145 -> 44108856 -> 21771288 -> 66446424 -> 23981958 and 23981958 as a term of A072142 is the first term of the periodic part of the trajectory of 10001145, period length is 14. %Y A072144 Cf. A072137, A072140, A072142, A072143, A072145. %K A072144 base,nonn %O A072144 1,1 %A A072144 _Klaus Brockhaus_, Jun 24 2002