OFFSET
1,2
COMMENTS
The logarithmic scatterplot of this sequence shows a banded structure similar to that of A092694. - Rémy Sigrist, Sep 03 2017
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10000
Paul Erdős, Andrew Granville, Carl Pomerance and Claudia Spiro, On the normal behavior of the iterates of some arithmetic functions, Analytic number theory, Birkhäuser Boston, 1990, pp. 165-204.
Paul Erdos, Andrew Granville, Carl Pomerance and Claudia Spiro, On the normal behavior of the iterates of some arithmetic functions, Analytic number theory, Birkhäuser Boston, 1990, pp. 165-204. [Annotated copy with A-numbers]
FORMULA
a(n) = n * A092694(n). - Rémy Sigrist, Sep 03 2017
EXAMPLE
Under phi, 7 -> 6 -> 2 -> 1, so a(7) = 7*6*2 = 84.
MATHEMATICA
Table[Times @@ FixedPointList[EulerPhi, n], {n, 44}] (* Michael De Vlieger, Sep 03 2017 *)
CROSSREFS
KEYWORD
nonn,look
AUTHOR
N. J. A. Sloane, Sep 02 2017
STATUS
approved