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 A271498 #12 May 20 2025 03:13:32 %S A271498 1,1,1,1,1,1,7,1,1,1,7,1,7,7,1,1,1,1,7,1,7,7,1,1,7,7,1,7,1,1,31,7,7,1, %T A271498 7,1,7,7,7,1,7,7,7,7,1,7,31,1,7,7,1,7,7,1,31,7,7,7,31,1,31,31,7,7,7,7, %U A271498 7,7,1,7,1,1,7,7,7,7,1,7,31,7,1,7,1,7,1,1,1,7,1,1,31,1,31,31,7,7,7,7 %N A271498 Smallest number in the trajectory of n under repeated application of the map k -> A271497(k). %C A271498 It appears that every number n eventually reaches one of the loops (1,2,3), (7,14,21), (31,62,93), ..., (2^(2*m-1)-1, 2^(2*m)-2, 3*(2^(2*m-1)-1)), ... %H A271498 Chai Wah Wu, <a href="/A271498/b271498.txt">Table of n, a(n) for n = 1..10000</a> %Y A271498 Cf. A271497. %K A271498 nonn,base %O A271498 1,7 %A A271498 _N. J. A. Sloane_, Apr 16 2016