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A112773
3 together with primes multiplied by 3.
4
3, 6, 9, 15, 21, 33, 39, 51, 57, 69, 87, 93, 111, 123, 129, 141, 159, 177, 183, 201, 213, 219, 237, 249, 267, 291, 303, 309, 321, 327, 339, 381, 393, 411, 417, 447, 453, 471, 489, 501, 519, 537, 543, 573, 579, 591, 597, 633, 669, 681, 687, 699, 717, 723, 753
OFFSET
1,1
COMMENTS
3 times the noncomposite numbers (see formula). Also column 2 of A272400. - Omar E. Pol, Apr 29 2016
LINKS
FORMULA
a(n) = 3*A008578(n). - Omar E. Pol, Jan 31 2012
MATHEMATICA
Insert[Table[3Prime[n], {n, 1, 60}], 3, 1] (* Stefan Steinerberger, Mar 30 2006 *)
CROSSREFS
Essentially the same as A001748.
Sequence in context: A082004 A364017 A352733 * A363615 A357989 A070885
KEYWORD
easy,nonn
AUTHOR
EXTENSIONS
Edited by N. J. A. Sloane, Apr 28 2008 at the suggestion of Alexander R. Povolotsky
STATUS
approved