The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #24 Feb 20 2017 00:26:31
%S 3,6,9,15,21,33,39,51,57,69,87,93,111,123,129,141,159,177,183,201,213,
%T 219,237,249,267,291,303,309,321,327,339,381,393,411,417,447,453,471,
%U 489,501,519,537,543,573,579,591,597,633,669,681,687,699,717,723,753
%N 3 together with primes multiplied by 3.
%C 3 times the noncomposite numbers (see formula). Also column 2 of A272400. - _Omar E. Pol_, Apr 29 2016
%H G. C. Greubel, <a href="/A112773/b112773.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) = 3*A008578(n). - _Omar E. Pol_, Jan 31 2012
%t Insert[Table[3Prime[n], {n, 1, 60}], 3, 1] (* _Stefan Steinerberger_, Mar 30 2006 *)
%Y Essentially the same as A001748.
%Y Cf. A000040, A001747, A008578, A008585, A046315.
%K easy,nonn
%O 1,1
%A _Jonathan Vos Post_ and _Ray Chandler_, Oct 15 2005
%E Edited by _N. J. A. Sloane_, Apr 28 2008 at the suggestion of _Alexander R. Povolotsky_