Indices of primes in the pentanacci numbers sequence A000322.

Terms

a(0) =5a(1) =7a(2) =13a(3) =18a(4) =19a(5) =34a(6) =35a(7) =38a(8) =43a(9) =48a(10) =188a(11) =286a(12) =450a(13) =501a(14) =759a(15) =1446a(16) =2021a(17) =2419a(18) =2997a(19) =3715a(20) =5677a(21) =13566a(22) =46303a(23) =57174a(24) =108844a(25) =117145a(26) =166683a(27) =178863