%I
%S 1,2,4,8,15,32,88,209,539,1403,3698,9962,26447,71579,196590,541473,
%T 1501720,4186566,11737617
%N a(n) = number of components of the graph P(n,3) (defined in Comments).
%C Let H(n,b) be the Hamming graph whose vertices are the sequences of length n over the alphabet {0,1,...,b1} with adjacency being defined by having Hamming distance 1. Let P(n,b) be the subgraph of H(n,b) induced by the set of vertices which are base b representations of primes with n digits (not allowing leading 0 digits).
%Y Cf. A145667A145674.
%K nonn,base,more
%O 1,2
%A _W. Edwin Clark_, Mar 17 2009
%E a(11)a(19) from _Max Alekseyev_, May 12 2011
