OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..2500
EXAMPLE
k = 12: proper divisors of 12 = {1,2,3,4,6} and 12 = 2 + 4 + 6 = 1 + 2 + 3 + 6.
MATHEMATICA
spdQ[n_]:=Module[{pds=Most[Divisors[n]]}, Length[Select[Subsets[ pds, Length[ pds]], Total[#] == n&]]==2]; Select[Range[1400], spdQ] (* Harvey P. Dale, Jan 23 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Oct 29 2009
STATUS
approved