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

Author

Charles R Greathouse IV and Jonathan Sondow, Aug 03 2013

Keywords

• nonn

Comments

A228023 is the main entry for this sequence.

Links

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

Crossrefs

Cf. A228023, A227986, A176797.

Formula

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