OFFSET
1,1
EXAMPLE
24 is a composite. 24 = 2^3 * 3 and 2^3 + 3 = 11, which is prime. So 24 is in the sequence.
MATHEMATICA
f[n_] := Plus @@ Power @@@ FactorInteger[n]; Select[Select[Range[425], PrimeQ[f[ # ]] &], ! PrimeQ[ # ] &] (* Ray Chandler, Dec 07 2005 *)
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Dec 05 2005
EXTENSIONS
Extended by Ray Chandler and Lambert Herrgesell (zero815(AT)googlemail.com), Dec 07 2005
STATUS
approved