OFFSET
0,2
EXAMPLE
a(2)=4 because 4 is the first number >2 that is not of the form 1^i+2^j; a(3)=7 because 7 is smallest number >4 not of form 1^i+2^j+3^k.
CROSSREFS
KEYWORD
nonn,nice
AUTHOR
EXTENSIONS
More terms from _David W. Wilson
Two more terms from Don Reble, Oct 27 2001
a(12) from Donovan Johnson, Oct 07 2009
a(13) from Donovan Johnson, Jul 26 2010
STATUS
approved