id:A052287 - OEIS Search Results

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Start with 3; the general rule is "if x is present then so is xy for every y<=x".

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3, 6, 9, 12, 18, 24, 27, 30, 36, 45, 48, 54, 60, 63, 72, 81, 84, 90, 96, 108, 120, 126, 132, 135, 144, 150, 162, 168, 180, 189, 192, 198, 210, 216, 225, 234, 240, 243, 252, 264, 270, 288, 297, 300, 306, 312, 315, 324, 330, 336, 351, 360, 378, 384, 390, 396 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	FORMULA	`x is an element if and only if x=3p1p2...pk with primes 2<=p1<=p2<=...<=pk and 3p1p2...pi >= p(i+1) for all i < k.`
	EXAMPLE	`63 is an element because 63=337 and 3<=3 and 7<=3*3.`
	CROSSREFS	`If instead we start with 2, we obtain the "Nullwertzahlen sequence" A047836.` `Sequence in context: A113241 A127621 A049707 this_sequence A063996 A065119 A092421` `Adjacent sequences: A052284 A052285 A052286 this_sequence A052288 A052289 A052290`
	KEYWORD	`easy,nice,nonn`
	AUTHOR	`Giuseppe Melfi (Giuseppe.Melfi(AT)ima.unil.ch), Feb 08 2000`
	EXTENSIONS	`More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jun 22 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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