OFFSET
1,1
COMMENTS
2^4=16,3^4=81,4^4=256=2^8 is not in the sequence,5^4=625,6^4=1296,...
MATHEMATICA
Select[Range[2, 100], GCD@@Last/@FactorInteger@#==1&]^4
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, Dec 19 2008
EXTENSIONS
Edited by Ray Chandler, Dec 22 2008
STATUS
approved