friendly/solitary numbers [was: typos]

[Eric W. Weisstein]

On Wed, 18 Sep 2002, Dean Hickerson wrote:

> Jon Perry mentioned typos in the Name and Comments of A074902.  There are
> also some terms missing up to 140.  I'll edit this one.

It it known if 10, 14, 15, 20, 22, etc. are actually friendly or solitary?  
Is there a more recent reference than 

Anderson, C. W and Hickerson, D. Problem 6020. "Friendly Integers." 
Amer. Math. Monthly 84, 65-66, 1977.

?

Cheers,
-Eric