id:A056136 - OEIS Search Results

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Largest positive integer whose harmonic mean with another positive integer is n.

+0
2

1, 2, 6, 6, 15, 12, 28, 20, 45, 30, 66, 42, 91, 56, 120, 72, 153, 90, 190, 110, 231, 132, 276, 156, 325, 182, 378, 210, 435, 240, 496, 272, 561, 306, 630, 342, 703, 380, 780, 420, 861, 462, 946, 506, 1035, 552, 1128, 600, 1225, 650, 1326, 702, 1431, 756, 1540 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) =1/(2/n-1/floor[n/2+1]) =nA008619(n)/(2A008619(n)-n) =(n/2)*A029578(n+2)`
	CROSSREFS	`Cf. A008619 for the smallest integer whose harmonic mean with another integer is n (i.e. harmonic mean of A008619 and a(n) is n).` `Sequence in context: A119312 A051398 A073131 this_sequence A098571 A161503 A019076` `Adjacent sequences: A056133 A056134 A056135 this_sequence A056137 A056138 A056139`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Jun 13 2000`

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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

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