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A225175
Largest number which requires n iterations of the bi-unitary totient function (A116550) to reach 1.
3
1, 2, 3, 6, 10, 11, 12, 18, 30, 42, 78, 106, 210, 366, 550, 603, 750, 1290, 2562, 4398, 4305, 7470, 9090, 14322, 24558, 35382, 55482, 78020, 141190, 207519, 301642, 429870, 552693, 684846, 1060710, 1391390, 2385246, 3454044
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.
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, May 01 2013
EXTENSIONS
a(26)-a(37) from Donovan Johnson, Dec 07 2013
STATUS
approved