id:A033845 - OEIS Search Results

Search: id:A033845

Displaying 1-1 of 1 results found.

page 1

Numbers n whose prime factors are 2 and 3.

+0
17

6, 12, 18, 24, 36, 48, 54, 72, 96, 108, 144, 162, 192, 216, 288, 324, 384, 432, 486, 576, 648, 768, 864, 972, 1152, 1296, 1458, 1536, 1728, 1944, 2304, 2592, 2916, 3072, 3456, 3888, 4374, 4608, 5184, 5832, 6144, 6912, 7776, 8748, 9216, 10368, 11664 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Solutions to phi(n)=n/3.` `n such that sum(d prime divisor of n, 1/d)=5/6 - Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 13 2002` `Also n such that sum(d\|n,mu(d)^2/d)=2 - Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 15 2002` `Complement of A006899 with respect to A003586; A086411(a(n))-A086410(a(n))=1. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 25 2008]`
	FORMULA	`Six times the 3-smooth numbers (A003586). - R. Stephan, Apr 16 2004`
	CROSSREFS	`Sequence in context: A028436 A037230 A033018 this_sequence A120942 A147306 A031478` `Adjacent sequences: A033842 A033843 A033844 this_sequence A033846 A033847 A033848`
	KEYWORD	`nonn`
	AUTHOR	`Jeff Burch (gburch(AT)erols.com)`

page 1

Search completed in 0.002 seconds

Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

AT&T Labs Research