a(1) = 1; then primes associated with A091850.

Terms

a(0) =1a(1) =5a(2) =17a(3) =29a(4) =59a(5) =89a(6) =173a(7) =229a(8) =373a(9) =463a(10) =617a(11) =773a(12) =877a(13) =1031a(14) =1181a(15) =1453a(16) =1759a(17) =2029a(18) =2447a(19) =2927a(20) =3347a(21) =3853a(22) =4451a(23) =5051a(24) =5801a(25) =6529a(26) =7393a(27) =8317a(28) =9419a(29) =10289