A227986 Antiharmonic mean of the divisors of A227771(n) (the n-th antiharmonic number that is not a square).

13, 35, 85, 91, 119, 185, 255, 245, 255, 313, 455, 481, 425, 455, 629, 559, 841, 845, 741, 765, 1183, 841, 793, 1355, 1015, 833, 935, 1295, 1547, 1105, 1443, 1505, 1445, 2197, 1785, 1799, 2735, 2041, 3315, 2405, 2135, 2523, 3523, 2873, 2755, 3605, 2191, 4165

Offset: 1

Author

Jonathan Sondow, Aug 02 2013

Keywords

• nonn

Comments

For comments, references, example, and crossrefs, see A227771.

Links

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

Crossrefs

Cf. A227771, A176797.

Formula

a(n) = sigma_2(A227771(n))/sigma_1(A227771(n)).