OFFSET
1,1
FORMULA
Applying cototient-function A051953 n+1 times to a(n), a power of 2 or 0 appears; a(n) is the smallest with this property.
EXAMPLE
a(6)=330 and the iteration of A051953 applied to 330 gives sequence {330,250,150,110,70,46,24,16,8,4,2,1,0}. Six iterations result in the 6th term 24 which still is neither a power of 2 nor 0. For smaller numbers than 330 these 6 iterations yield a power of 2 or the fixed number 0.
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jan 14 2000
EXTENSIONS
More terms from Jud McCranie, Jan 14 2000
STATUS
approved