%I #10 Mar 15 2014 05:29:25

%S 1,1,4,1,1,2,1,2,3,1,1,2,3,1,6,1,1,2,1,1,1,3,2,1,5,2,1,4,2,1,3,1,2,1,

%T 1,1,3,1,4,1,2,1,2,5,1,1,1,2,4,1,3,1,2,1,2,1,2,1,4,1,1,3,1,2,1,1,3,2,

%U 1,2,1,3,1,1,8,2,1,1,2,1,2,3,1,5,1,2,3,1,2,1,4,1,1,2,6,1,2,1,3,1

%N Exponent of 2 in prime factorization (i.e., 2-adic valuation) of odd nonprimes A014076(n) + 1.

%C Sequence is counterpart to A023512, i.e., merging these two sequences gives the ruler function A001511.

%H K. G. Stier, <a href="/A239114/b239114.txt">Table of n, a(n) for n = 1..7739</a>

%F a(n) = A001511((A014076(n)+1)/2)

%e a(13) = 3, because the 13th odd nonprime is 55, and the largest power of 2 dividing 55+1 is 3.

%o (PARI) lista(nn) = {forstep(n=1, nn, 2, if (! isprime(n), print1(valuation(n+1, 2), ", ")););} \\ _Michel Marcus_, Mar 13 2014

%Y Cf. A023512, A001511, A014076.

%K nonn

%O 1,3

%A _K. G. Stier_, Mar 10 2014