Indices of prime Lucas 5-step numbers, A074048.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =8a(5) =9a(6) =10a(7) =13a(8) =30a(9) =35a(10) =77a(11) =98a(12) =126a(13) =160a(14) =192a(15) =810a(16) =1086a(17) =1999a(18) =2021a(19) =3157a(20) =3426a(21) =3471a(22) =15066a(23) =24115a(24) =29782a(25) =29941