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A225173
Number of numbers which require n iterations of the unitary totient function (A047994) to reach 1.
5
1, 1, 2, 4, 9, 21, 38, 82, 164, 261, 424, 749, 1097, 1721, 2592, 4351, 7319, 10725, 17013, 27773, 44767, 73914, 118990, 185059, 275055, 401059, 617679, 935331, 1379826, 2089569, 2962015, 3899417, 5202824
OFFSET
0,3
LINKS
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, May 01 2013
EXTENSIONS
a(16)-a(32) from Donovan Johnson, May 02 2013
STATUS
approved