OFFSET
1,1
COMMENTS
This appears to be the smallest example known of this type.
Note that it has the property that no number divides another.
LINKS
N. Burshtein, An improved solution of Sum_{i=1..k} 1/x_i = 1 ..., NNTDM 16 (2010), 2, 1-4.
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
N. J. A. Sloane, Dec 02 2011
STATUS
approved