A175859 a(n) = numbers k in increasing order such that A175856(m) = k has no solution for any m, where A175856(m): a(m) = m for m = noncomposites, a(m) = previous term - 1 for m = composites.

8, 9, 14, 15, 24, 25, 32, 33, 38, 39, 54, 55, 62, 63, 74, 75, 90, 91, 92, 93, 98, 99, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 140, 141, 142, 143, 144, 145, 158, 159, 182, 183, 184, 185, 186, 187, 212, 213

Offset

1,1

Comments

Absent positive integers (pairs of consecutive numbers) in sequence A175856(n).

Complement of A175857(n).

A175860(a(n)) = 0, A175861(a(n)) = 1, A175862(a(n)) = 0.

Links

Antti Karttunen, Table of n, a(n) for n = 1..22312

Formula

a(2k) = a(2k-1) + 1 for k >= 1.

Crossrefs

Cf. A175856, A175857, A175858, A175860, A175861, A175862.

Sequence in context: A068780 A174041 A096784 * A059869 A327863 A213016

Adjacent sequences: A175856 A175857 A175858 * A175860 A175861 A175862

Keyword

nonn

Author

Jaroslav Krizek, Sep 29 2010

Status

approved