A064674 Number of primes q such that phiter(q)=n where phiter(n)=A064415(n).

0, 2, 2, 3, 6, 12, 23, 46, 94, 198, 424, 854, 1859, 3884, 8362, 17837, 38977, 84188, 183167, 398685, 874078

Offset

0,2

Comments

For n>1, a(n) is the number of primes in class n of the Phi iteration. See A003434 and A058812. [From T. D. Noe, Nov 05 2008]

Links

Table of n, a(n) for n=0..20.

Crossrefs

Cf. A000010, A003434, A064415, A064416.

Sequence in context: A162599 A064319 A307241 * A095902 A103687 A166678

Adjacent sequences: A064671 A064672 A064673 * A064675 A064676 A064677

Keyword

nonn,more

Author

Christian WEINSBERG (cweinsbe(AT)fr.packardbell.org), Oct 10 2001

Extensions

a(12)-a(16) from T. D. Noe, Nov 05 2008

a(17)-a(20) from Sean A. Irvine, Jul 22 2023

Status

approved