Indices k such that A019326(k)=Phi[k](8) is prime, where Phi is a cyclotomic polynomial.

Terms

a(0) =1a(1) =3a(2) =9a(3) =30a(4) =42a(5) =78a(6) =87a(7) =138a(8) =189a(9) =303a(10) =318a(11) =330a(12) =408a(13) =462a(14) =504a(15) =561a(16) =1002a(17) =1389a(18) =1746a(19) =1794a(20) =2040a(21) =2418a(22) =2790a(23) =3894a(24) =4077a(25) =4722a(26) =6738a(27) =10641a(28) =14610a(29) =14616