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

A064674

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

Terms

    a(0) =0a(1) =2a(2) =2a(3) =3a(4) =6a(5) =12a(6) =23a(7) =46a(8) =94a(9) =198a(10) =424a(11) =854a(12) =1859a(13) =3884a(14) =8362a(15) =17837a(16) =38977a(17) =84188a(18) =183167a(19) =398685a(20) =874078

External references