a(n) is the smallest number k such that psi(k) = A001615(k) is the product of n distinct primes.

A291144

a(n) is the smallest number k such that psi(k) = A001615(k) is the product of n distinct primes.

Terms

    a(0) =2a(1) =4a(2) =25a(3) =218a(4) =1538a(5) =20018a(6) =570569a(7) =9869858a(8) =148728578a(9) =7865117258a(10) =198255197138

External references