Indices k such that A020510(k)=Phi[k](-11) is prime, where Phi is a cyclotomic polynomial.

Terms

a(0) =5a(1) =7a(2) =18a(3) =20a(4) =21a(5) =30a(6) =34a(7) =36a(8) =38a(9) =52a(10) =54a(11) =60a(12) =90a(13) =104a(14) =117a(15) =123a(16) =146a(17) =159a(18) =179a(19) =182a(20) =229a(21) =278a(22) =388a(23) =405a(24) =410a(25) =439a(26) =552a(27) =557a(28) =735a(29) =806