Indices of prime numbers in A014258.

Terms

a(0) =3a(1) =4a(2) =5a(3) =7a(4) =9a(5) =18a(6) =19a(7) =21a(8) =22a(9) =25a(10) =27a(11) =47a(12) =97a(13) =107a(14) =154a(15) =186a(16) =205a(17) =303a(18) =363a(19) =1385a(20) =1515a(21) =1546a(22) =2642a(23) =2795a(24) =2825a(25) =3193a(26) =10969a(27) =11554a(28) =24629a(29) =25746