id:A087134 - OEIS Search Results

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Smallest number having exactly n divisors that is not greater than its greatest prime factor.

+0
6

1, 2, 6, 20, 42, 84, 156, 312, 684, 1020, 1380, 1860, 3480, 3720, 4920, 7320, 10980, 14640, 16920, 21960, 26280, 34920, 45720, 59640, 69840, 89880, 106680, 125160, 145320, 177240, 213360, 244440 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A087133(a(n))=n and A087133(k)<n for k<a(n).` `Also smallest number such that the n-th divisor is prime. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 15 2006`
	LINKS	`Eric Weisstein's World of Mathematics, Divisor Function` `Eric Weisstein's World of Mathematics, Greatest Prime Factor`
	EXAMPLE	`a(3) = A119313(1) = 6.`
	CROSSREFS	`Cf. A006530.` `Cf. A119311, A119312.` `Sequence in context: A064701 A130315 A087150 this_sequence A036689 A139115 A121128` `Adjacent sequences: A087131 A087132 A087133 this_sequence A087135 A087136 A087137`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 17 2003`
	EXTENSIONS	`More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 15 2006`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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