OFFSET
1,3
COMMENTS
EXAMPLE
27 is in the sequence because a single-digit number is reached in 3 iterations: 7^2 = 49, 9^4 = 6561, ((1^6)^5)^6 = 1, so A175424(27) = 3.
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Jaroslav Krizek, May 09 2010
STATUS
approved