A225176 Number of numbers which require n iterations of the bi-unitary totient function (A116550) to reach 1.

1, 1, 1, 2, 3, 2, 2, 4, 7, 6, 13, 12, 16, 24, 31, 51, 66, 87, 126, 139, 187, 260, 331, 412, 551, 693

Offset: 1

Author

N. J. A. Sloane, May 01 2013

Keywords

• nonn
• more

References

• M. Lal, H. Wareham and R. Mifflin, Iterates of the bi-unitary totient function, Utilitas Math., 10 (1976), 347-350.

Crossrefs

Cf. A116550, A005424, A225175, A225174, A047994, A003271, A225172, A225173.