Positions of primes in A000408.

Terms

a(0) =1a(1) =4a(2) =7a(3) =9a(4) =15a(5) =22a(6) =24a(7) =32a(8) =36a(9) =37a(10) =41a(11) =46a(12) =54a(13) =58a(14) =64a(15) =67a(16) =72a(17) =74a(18) =76a(19) =89a(20) =94a(21) =96a(22) =104a(23) =110a(24) =114a(25) =123a(26) =128a(27) =130a(28) =139a(29) =143