A112773 3 together with primes multiplied by 3.

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

G. C. Greubel, Table of n, a(n) for n = 1..1000

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.

Cf. A000040, A001747, A008578, A008585, A046315.

Sequence in context: A082004 A364017 A352733 * A363615 A357989 A070885

Adjacent sequences: A112770 A112771 A112772 * A112774 A112775 A112776

Keyword

easy,nonn

Author

Jonathan Vos Post and Ray Chandler, Oct 15 2005

Extensions

Edited by N. J. A. Sloane, Apr 28 2008 at the suggestion of Alexander R. Povolotsky

Status

approved