%I A001600 M0609 N0220
%S A001600 1,2,3,5,6,5,8,9,11,10,7,15,15,14,17,24,24,21,13,19,27,25,29,26,44,44,
               29,
%T A001600 46,39,46,27,42,47,47,54,35,41,60,51,37,48,45,49,50,49,53,77,86,86,51,
%U A001600 96,75,70,80,99,110,81,84,13,102,82,96,114,53,108,115,105,116,91,85,105
%N A001600 Harmonic means of divisors of harmonic numbers.
%C A001600 Values of n*tau(n)/sigma(n) corresponding to terms of A001599, where 
               tau(n) (A000005) is the number of divisors of n and sigma(n) is the 
               sum of the divisors of n (A000203).
%D A001600 Garcia, Mariano; On numbers with integral harmonic mean. Amer. Math. 
               Monthly 61, (1954). 89-96.
%D A001600 O. Ore, On the averages of the divisors of a number, Amer. Math. Monthly, 
               55 (1948), 615-619.
%D A001600 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001600 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A001600 T. D. Noe, <a href="b001600.txt">Table of n, a(n) for n=1..115</a>
%H A001600 Matthew M. Conroy, <a href="http://www.madandmoonly.com/doctormatt">Home 
               page</a> (listed instead of email address)
%H A001600 Takeshi Goto, <a href="http://www.ma.noda.tus.ac.jp/u/tg/html/harmonic-e.html#mark1">
               All harmonic numbers less than 10^14</a>
%H A001600 Takeshi Goto, <a href="http://www.ma.noda.tus.ac.jp/u/tg/files/list4">
               Table of a(n) for n=1..937</a>
%Y A001600 Cf. A001599, A090240 (sorted values).
%Y A001600 Sequence in context: A054077 A082654 A072636 this_sequence A000036 A165081 
               A165089
%Y A001600 Adjacent sequences: A001597 A001598 A001599 this_sequence A001601 A001602 
               A001603
%K A001600 nonn,nice,easy
%O A001600 1,2
%A A001600 N. J. A. Sloane (njas(AT)research.att.com).
%E A001600 More terms from Matthew Conroy (list1(AT)madandmoonly.com), Jan 15 2006