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 A072015 #4 Mar 30 2012 18:50:24 %S A072015 1,2,1,4,7,2,7,8,1,14,9,4,15,14,7,16,19,2,19,28,7,18,21,8,49,30,1,28, %T A072015 31,14,31,32,9,38,35,4,39,38,15,56,43,14,43,36,7,42,45,16,49,98,19,60, %U A072015 63,2,63,56,19,62,57,28,63,62,7,64,105,18,105,76,21,70 %N A072015 Maxima when the mapping of A072010 is applied to n repeatedly. %e A072015 The trajectory of 89 under the A072010-mapping is: %e A072015 89 ->91 ->75 ->49 ->25 ->49 ..., therefore a(89) = 91. %Y A072015 Cf. A072014. %K A072015 nonn %O A072015 1,2 %A A072015 _Reinhard Zumkeller_, Jun 05 2002