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 A145667 a(n) = number of components of the graph P(n,2) (defined in Comments). 12
 0, 1, 1, 2, 1, 2, 4, 11, 13, 19, 29, 43, 107, 169, 350, 603, 1134, 2070, 3803, 7502, 13989, 26495, 50826, 97369, 185827, 357307, 690577, 1332382, 2565110, 4958962, 9594425 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Let H(n,b) be the Hamming graph whose vertices are the sequences of length n over the alphabet {0,1,...,b-1} 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). LINKS CROSSREFS Cf. A145667-A145674, A104080, A014234. Sequence in context: A024500 A318870 A000087 * A095067 A225564 A032259 Adjacent sequences:  A145664 A145665 A145666 * A145668 A145669 A145670 KEYWORD nonn,base,more AUTHOR W. Edwin Clark, Mar 17 2009 EXTENSIONS a(18)-a(31) from Max Alekseyev, May 12 2011 STATUS approved

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Last modified December 1 06:09 EST 2020. Contains 338833 sequences. (Running on oeis4.)