Numbers n such that the number of primes not exceeding sigma(n) equals phi(n), i.e., pi(sigma(n)) = phi(n).
A067787
Numbers n such that the number of primes not exceeding sigma(n) equals phi(n), i.e., pi(sigma(n)) = phi(n).
Terms
- a(0) =3a(1) =9a(2) =34a(3) =190a(4) =224a(5) =606a(6) =680a(7) =4128a(8) =6996a(9) =8928
External references
- oeis: A067787