Numbers k such that k=prime(phi(sigma(pi(k)))).

Terms

a(0) =2a(1) =3a(2) =19a(3) =37a(4) =719a(5) =1511a(6) =5443a(7) =69709a(8) =386093a(9) =1907819a(10) =10777931a(11) =17819101a(12) =18653749a(13) =56125547a(14) =60163267a(15) =98911811a(16) =272887613a(17) =567611663a(18) =989060309a(19) =2444540149