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

1,1

Comments

Complement of A081000.

Links

Table of n, a(n) for n=1..64.

Formula

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

Crossrefs

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

Sequence in context: A282057 A336366 A088502 * A075025 A075394 A158439

Adjacent sequences: A080998 A080999 A081000 * A081002 A081003 A081004

Keyword

nonn

Author

Matthew Vandermast, Mar 02 2003

Status

approved