a(n) is the smallest k such that psi(k)/phi(k) is prime where k is the product of n distinct primes.

A291972

a(n) is the smallest k such that psi(k)/phi(k) is prime where k is the product of n distinct primes.

Terms

    a(0) =2a(1) =15a(2) =78a(3) =910a(4) =16770a(5) =399126a(6) =4849845a(7) =27606810a(8) =1543735830a(9) =46091541210

External references