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 A359131 #14 Jul 09 2025 04:59:51 %S A359131 0,2,1,5,4,2,3,6,5,6,2,10,8,9,7,8,6,11,9,4,7,5,8,3,9,7,4,2,3,6,9,7,10, %T A359131 5,8,6,11,4,2,10,3,9,10,11,12,3,6,5,11,4,10,5,3,6,7,9,7,2,7,5,8,6,4,7, %U A359131 5,8,3,6,9,10,5,8,3,7,8,8,13,11,11,9,12,2 %N A359131 Number of odd primes in the Collatz trajectory of A177000(n). %C A359131 Equivalently, a(n) = A055509(A177000(n)). %H A359131 Michael S. Branicky, <a href="/A359131/b359131.txt">Table of n, a(n) for n = 1..10000</a> %Y A359131 Cf. A055509, A078350, A078373, A177000. %K A359131 nonn %O A359131 1,2 %A A359131 _N. J. A. Sloane_, Dec 29 2022, following a suggestion from Rudolfo Nieves %E A359131 a(38) and beyond from _Michael S. Branicky_, Dec 30 2022