OFFSET
0,1
COMMENTS
Here uphi(n)=A047994(n) is the unitary totient function: if n = Product p_i^e_i, uphi(n) = Product (p_i^e_i - 1).
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Kohmoto found 2nd, 6th, 13th, 25th terms. Dean Hickerson calculated the other terms.
STATUS
approved