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A171993
Numbers that are neither prime nor multiples of 3.
2
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.
FORMULA
a(n) = A157695(n-1), n>1. [From R. J. Mathar, Feb 07 2010]
a(n) ~ 1.5n.
CROSSREFS
Sequence in context: A342734 A092292 A299482 * A157695 A175228 A099861
KEYWORD
nonn,less
AUTHOR
EXTENSIONS
Edited by Charles R Greathouse IV, Mar 19 2010
STATUS
approved