id:A156329 - OEIS Search Results

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Smallest tetrahedral number with n distinct prime factors.

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4, 10, 84, 1140, 7140, 125580, 2929290, 161226780, 2875585020, 32451432090, 9117204216120, 173092525291140, 12728365882372140, 6235727798083743960, 843456728066008506450, 68313970807402942762140 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(17) = 7219596660397839675355860.`
	LINKS	`Eric Weisstein's World of Mathematics, Tetrahedral Numbers.`
	EXAMPLE	`a(9) = 2875585020 = 2^23571117194147. 2875585020 is the smallest tetrahedral number with 9 distinct prime factors.`
	CROSSREFS	`Cf. A000292.` `Sequence in context: A152397 A059919 A143047 this_sequence A125855 A153743 A098449` `Adjacent sequences: A156326 A156327 A156328 this_sequence A156330 A156331 A156332`
	KEYWORD	`nonn`
	AUTHOR	`Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 08 2009`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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