OFFSET
0,3
EXAMPLE
2 is not divisible by 2^2, thus a(2) = 0, the only zero in the sequence.
2^4 = 16 is the fifth term in [1, 4, 8, 9, 16, 18, 25, 27, 32, 36, ...] (the union of {1} and A070003), thus a(4) = 5.
2^5 = 32 is the ninth term in the same list, thus a(5) = 9.
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jul 21 2014
STATUS
approved