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

Author

Jaroslav Krizek, Mar 07 2009

Keywords

• nonn

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.

Extensions

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