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 A308781 #21 May 06 2023 09:03:10 %S A308781 10,12,11,12,8,10,10,10,10,10,9,11,10,11,7,9,9,9,9,9,6,10,0,9,6,6,6,6, %T A308781 6,6,8,11,9,10,6,8,8,8,8,8,9,7,6,6,7,8,9,9,9,9,10,9,6,8,8,7,9,10,10, %U A308781 10,12,9,6,8,9,9,7,10,12,12,13,9,6,8,9,10,10,7,12,13,14,9,6,8,9,10,12,12,7,13,14,9,6,8,9,10,12,13,13,7,6 %N A308781 Number of steps until the 'summarize the previous term' sequence enters a cycle. %C A308781 The corresponding lengths of the cycle are given by A036225. %C A308781 Is this a duplicate of A103618? - _R. J. Mathar_, May 05 2023 %e A308781 a(0) = 10, as shown by the 'summarize the previous term' sequence starting with 0: 0 -> 10 -> 1011 -> 1031 -> 102113 -> 10311213 -> 10411223 -> 1031221314 -> 1041222314 -> 1031321324 -> 1031223314 -> 1031223314 (see also A037220). %Y A308781 Cf. A036225, A037220. %K A308781 nonn,base %O A308781 0,1 %A A308781 _A.H.M. Smeets_, Jun 24 2019