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A157849 Numbers k such that are not harmonic means of divisors of harmonic (Ore) numbers (harmonic (Ore) numbers is A001599). 1
4, 12, 16, 18, 20, 22, 23, 28, 30, 32, 33, 34, 36, 38, 40, 43, 52, 55, 56, 57, 58, 59, 62, 63, 64, 65, 66, 67, 68, 69, 71, 72, 74, 76, 79, 90, 93, 95, 98, 100, 103, 104, 109, 111, 112, 113, 119, 122, 123, 124, 126, 129, 131, 133, 134, 136, 137, 138, 141, 142, 146, 148, 151, 154, 157, 162, 170 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) non-occurring in A001600(m) = A001599(m)*tau(A001599(m))/sigma(A001599(m)) = A001599(m)*A000005(A001599(m))/A000203(A001599(m)).

LINKS

Robert G. Wilson v, Table of n, a(n) for n = 1..412

Takeshi Goto, On Ore's harmonic numbers, slides, Tokyo University of Science, Japan.

CROSSREFS

Cf. A001600, A001599, A000005, A000203.

Sequence in context: A335528 A163838 A228091 * A137257 A144976 A119622

Adjacent sequences:  A157846 A157847 A157848 * A157850 A157851 A157852

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Mar 07 2009

EXTENSIONS

More terms from Robert G. Wilson v, Aug 18 2013

STATUS

approved

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Last modified September 18 06:35 EDT 2020. Contains 337166 sequences. (Running on oeis4.)