id:A033992 - OEIS Search Results

Search: id:A033992

Displaying 1-1 of 1 results found.

page 1

Numbers that are divisible by exactly three different primes.

+0
15

30, 42, 60, 66, 70, 78, 84, 90, 102, 105, 110, 114, 120, 126, 130, 132, 138, 140, 150, 154, 156, 165, 168, 170, 174, 180, 182, 186, 190, 195, 198, 204, 220, 222, 228, 230, 231, 234, 238, 240, 246, 252, 255, 258, 260, 264, 266, 270, 273, 276, 280, 282, 285 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Below 210, A000977 and this sequence are identical.`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	FORMULA	`omega(a(n)) = A001221(a(n)) = 3. - Jonathan Vos Post (jvospost3(AT)gmail.com), Sep 20 2005`
	EXAMPLE	`220=225*11 is here but 210 is not; compare A000977.`
	CROSSREFS	`Cf. A000977, A007774, A000961, A033993, A051270.` `Cf. A112802.` `Sequence in context: A090800 A114816 A000977 this_sequence A091454 A136152 A090815` `Adjacent sequences: A033989 A033990 A033991 this_sequence A033993 A033994 A033995`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

page 1

Search completed in 0.002 seconds

Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

AT&T Labs Research