id:A157850 - OEIS Search Results

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Numbers k such that are harmonic means of divisors of harmonic (Ore) numbers (harmonic numbers is A001599) and equal to one of the divisors of this harmonic numbers.

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1, 2, 5, 6, 8, 9, 11, 10, 15, 15, 14, 17, 24, 24, 21, 13, 19, 27, 25, 29, 26, 44, 44, 29, 46, 39, 46 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n)=A007340(n)tau(A007340(n))/sigma(A007340(n))=A007340(n)A000005((A007340(n))/A000203(A007340(n)).`
	EXAMPLE	`a(3) = 5, because 5 is harmonic mean of divisors of A007340(3)=140 and also is divisor of 140.`
	CROSSREFS	`Cf. A007340, A000005, A000203, A001599.` `Sequence in context: A090946 A047442 A005781 this_sequence A049636 A045573 A161152` `Adjacent sequences: A157847 A157848 A157849 this_sequence A157851 A157852 A157853`
	KEYWORD	`nonn`
	AUTHOR	`Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Mar 07 2009, Apr 12 2009`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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