A081001 n is in the sequence if and only if it does not rank among the top n positive integers in centrality (cf. A080997 for fuller explanation of this concept).

5, 7, 9, 11, 13, 17, 19, 22, 23, 25, 26, 29, 31, 33, 34, 35, 37, 38, 39, 41, 43, 46, 47, 49, 51, 53, 55, 57, 58, 59, 61, 62, 65, 67, 69, 71, 73, 74, 77, 79, 81, 82, 83, 85, 86, 87, 89, 91, 92, 93, 94, 95, 97, 101, 103, 106, 107, 109, 111, 113, 115, 116, 118, 119

Offset: 1

Author

Matthew Vandermast, Mar 02 2003

Keywords

• nonn

Comments

Complement of A081000.

Crossrefs

Cf. A080997, A080998, also A081028 for centrality ranks of primes (all of which are members of this sequence except 2 and 3).

Formula

Formula for the centrality of n: A018804(n)/n^2 (see also A080997).