A228024 Antiharmonic mean of the divisors of A228023(n) (the n-th primitive antiharmonic number).

1, 13, 35, 85, 119, 185, 255, 313, 455, 481, 425, 455, 629, 841, 845, 741, 1183, 841, 1355, 1015, 1547, 1105, 1445, 2197, 1799, 2735, 3315, 2405, 3523, 2873, 2755, 3605, 4165, 4595, 4607, 5705, 5525, 5365, 7111, 7995, 5915, 7157, 6165, 8285, 5525, 9373, 10933, 11305, 7813

Offset

1,2

Comments

A228023 is the main entry for this sequence.

Links

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Formula

a(n) = sigma_2(A228023(n))/sigma(A228023(n)).

Crossrefs

Cf. A228023, A227986, A176797.

Sequence in context: A063300 A368361 A227986 * A243383 A242578 A192145

Adjacent sequences: A228021 A228022 A228023 * A228025 A228026 A228027

Keyword

nonn

Author

Charles R Greathouse IV and Jonathan Sondow, Aug 03 2013

Status

approved