id:A156238 - OEIS Search Results

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Smallest heptagonal number with n distinct prime factors.

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4

7, 18, 286, 3010, 32890, 769230, 3333330, 159189030, 16015883940, 477463360374, 21643407275490, 1148540321999070, 18489352726664820, 4561561662153109614, 71000485538666794110, 14440652550858108745170 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Eric Weisstein's World of Mathematics, Heptagonal Numbers.`
	EXAMPLE	`a(9) = 16015883940 = 2^23^2571719232959. 16015883940 is the smallest heptagonal number with 9 distinct prime factors.`
	CROSSREFS	`Cf. A000566, A076551, A156236, A156237, A156239.` `Sequence in context: A019534 A024830 A030982 this_sequence A156295 A070414 A125257` `Adjacent sequences: A156235 A156236 A156237 this_sequence A156239 A156240 A156241`
	KEYWORD	`nonn`
	AUTHOR	`Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 07 2009`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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