OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[210], IntegerQ[Mean[Rest[Most[Divisors[#]]]]]&] (* Harvey P. Dale, Feb 20 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Clarified definition -- Harvey P. Dale, Feb 20 2011
STATUS
approved