Single (or isolated or non-twin) primes: Primes p such that neither p-2 nor p+2 is prime.

Terms

a(0) =2a(1) =23a(2) =37a(3) =47a(4) =53a(5) =67a(6) =79a(7) =83a(8) =89a(9) =97a(10) =113a(11) =127a(12) =131a(13) =157a(14) =163a(15) =167a(16) =173a(17) =211a(18) =223a(19) =233a(20) =251a(21) =257a(22) =263a(23) =277a(24) =293a(25) =307a(26) =317a(27) =331a(28) =337a(29) =353