OFFSET
0,1
COMMENTS
Only unique powers are shown here. E.g., 4096 = 4^6 = 8^4, but 4096 is only in the sequence once. - Franklin T. Adams-Watters, Sep 28 2011
EXAMPLE
The sequence starts with 256, because 256 is the smallest composite number to the smallest composite power.
MATHEMATICA
comp = Select[Range[2, 40], ! PrimeQ[ # ] &]; Select[ Union[Flatten[ Table[comp[[n]]^comp[[k]], {n, Length[comp]}, {k, Length[comp]}]]], # < comp[[Length[comp]]]^4 &]
CROSSREFS
KEYWORD
nonn
AUTHOR
Tanya Khovanova, May 29 2007
STATUS
approved