OFFSET
0,2
COMMENTS
a(26) >= 55482. a(27) >= 78020. - R. J. Mathar, May 05 2013
REFERENCES
M. Lal, H. Wareham and R. Mifflin, Iterates of the bi-unitary totient function, Utilitas Math., 10 (1976), 347-350.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, May 01 2013
EXTENSIONS
a(26)-a(37) from Donovan Johnson, Dec 07 2013
STATUS
approved