A171993 Numbers that are neither prime nor multiples of 3.

1, 4, 8, 10, 14, 16, 20, 22, 25, 26, 28, 32, 34, 35, 38, 40, 44, 46, 49, 50, 52, 55, 56, 58, 62, 64, 65, 68, 70, 74, 76, 77, 80, 82, 85, 86, 88, 91, 92, 94, 95, 98, 100, 104, 106, 110, 112, 115, 116, 118, 119, 121, 122, 124, 125, 128, 130, 133, 134, 136, 140, 142, 143

Offset

1,2

Comments

1 together with composite numbers that are not multiples of 3.

Links

Table of n, a(n) for n=1..63.

Formula

a(n) = A157695(n-1), n>1. [From R. J. Mathar, Feb 07 2010]

a(n) ~ 1.5n.

Crossrefs

Cf. A018252, A157695.

Sequence in context: A342734 A092292 A299482 * A157695 A175228 A099861

Adjacent sequences: A171990 A171991 A171992 * A171994 A171995 A171996

Keyword

nonn,less

Author

Juri-Stepan Gerasimov, Jan 21 2010

Extensions

Edited by Charles R Greathouse IV, Mar 19 2010

Status

approved