Numbers n such that n-th cyclotomic polynomial evaluated at phi(n) is a prime number.

Terms

a(0) =2a(1) =3a(2) =4a(3) =6a(4) =7a(5) =8a(6) =12a(7) =18a(8) =21a(9) =30a(10) =45a(11) =48a(12) =70a(13) =120a(14) =127a(15) =153a(16) =182a(17) =204a(18) =212a(19) =282a(20) =318a(21) =322a(22) =910a(23) =1167a(24) =1177a(25) =1342a(26) =1680a(27) =1963a(28) =2670a(29) =4398