A064416 Number of integers q such that phiter(q)=n where phiter(n) = A064415(n).

1, 2, 5, 11, 26, 59, 137, 312, 719, 1651, 3816, 8757, 20202, 46440, 106957, 245989, 566561, 1303968, 3002247, 6910122, 15909143

Offset: 0

Author

Christian WEINSBERG (cweinsbe(AT)fr.packardbell.org), Sep 30 2001

Keywords

• nonn
• more

Links

• Hartosh Singh Bal, Combinatorics of a Class of Completely Additive Arithmetic Functions, arXiv:2308.00455 [math.CO], 2023. See Table 12 p. 17.

Crossrefs

Cf. A000010, A064415.

Formula

If 2<=n<=6, a(n)=a(n-1)+3*a(n-2).

Extensions

a(14)-a(20) from Sean A. Irvine, Jul 07 2023