OFFSET
1,1
COMMENTS
2 is in the list because composite(2)+2 =6+2 = 8 and 8 is composite.
5 is in the list because composite(5)+5 =10+5 = 15 and 15 is composite.
MATHEMATICA
With[{comps=Complement[Range[2, 250], Prime[Range[PrimePi[250]]]]}, Transpose[Select[Thread[{Range[Length[comps]], comps}], !PrimeQ[ Total[#]]&]][[1]]] (* Harvey P. Dale, Dec 02 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Claudio Meller, Jun 13 2009
STATUS
approved