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 A108353 #6 Nov 25 2013 08:58:11
%S A108353 2,1,3,20,756,178200
%N A108353 For each nonnegative integer n, a(n) is the smallest positive integer j whose primal code characteristic is n, that is, the smallest j such that A108352(j) = n.
%C A108353 Suggested by Antti Karttunen.
%H A108353 J. Awbrey, <a href="https://oeis.org/wiki/Riffs_and_Rotes">Riffs and Rotes</a>
%e A108353 Writing (prime(i))^j as i:j, we have the following table:
%e A108353 Primal Functions and Functional Digraphs for a(0) to a(5)
%e A108353 ` ` ` 2 = 1:1 ` ` ` ` ` ` || 1 -> 1 (infinite loop)
%e A108353 ` ` ` 1 = { } ` ` ` ` ` ` || 1
%e A108353 ` ` ` 3 = 2:1 ` ` ` ` ` ` || 2 -> 1
%e A108353 ` ` `20 = 1:2 3:1 ` ` ` ` || 3 -> 1 -> 2
%e A108353 ` ` 756 = 1:2 2:3 4:1 ` ` || 4 -> 1 -> 2 -> 3
%e A108353 `178200 = 1:3 2:4 3:2 5:1 || 5 -> 1 -> 3 -> 2 -> 4
%Y A108353 Cf. A106177, A108352, A108370, A108371, A108372, A108373, A108374, A111801.
%K A108353 nonn
%O A108353 0,1
%A A108353 _Jon Awbrey_, Jun 17 2005, extended Aug 20 2005