A064674 - OEIS

%I #6 Jul 22 2023 08:13:09

%S 0,2,2,3,6,12,23,46,94,198,424,854,1859,3884,8362,17837,38977,84188,

%T 183167,398685,874078

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

%C 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]

%Y Cf. A000010, A003434, A064415, A064416.

%K nonn,more

%O 0,2

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

%E a(12)-a(16) from _T. D. Noe_, Nov 05 2008

%E a(17)-a(20) from _Sean A. Irvine_, Jul 22 2023