A108353 - OEIS

%I #6 Nov 25 2013 08:58:11

%S 2,1,3,20,756,178200

%N 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 Suggested by Antti Karttunen.

%H J. Awbrey, <a href="https://oeis.org/wiki/Riffs_and_Rotes">Riffs and Rotes</a>

%e Writing (prime(i))^j as i:j, we have the following table:

%e Primal Functions and Functional Digraphs for a(0) to a(5)

%e ` ` ` 2 = 1:1 ` ` ` ` ` ` || 1 -> 1 (infinite loop)

%e ` ` ` 1 = { } ` ` ` ` ` ` || 1

%e ` ` ` 3 = 2:1 ` ` ` ` ` ` || 2 -> 1

%e ` ` `20 = 1:2 3:1 ` ` ` ` || 3 -> 1 -> 2

%e ` ` 756 = 1:2 2:3 4:1 ` ` || 4 -> 1 -> 2 -> 3

%e `178200 = 1:3 2:4 3:2 5:1 || 5 -> 1 -> 3 -> 2 -> 4

%Y Cf. A106177, A108352, A108370, A108371, A108372, A108373, A108374, A111801.

%K nonn

%O 0,1

%A _Jon Awbrey_, Jun 17 2005, extended Aug 20 2005