A157849 Numbers k such that are not harmonic means of divisors of harmonic (Ore) numbers (harmonic (Ore) numbers is A001599).

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

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 A368715 A144976

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