Smallest prime p such that both p +/- 2n are primes closest to p, or zero if no such prime exists.

Terms

a(0) =5a(1) =0a(2) =53a(3) =0a(4) =0a(5) =211a(6) =0a(7) =0a(8) =20201a(9) =0a(10) =0a(11) =16787a(12) =0a(13) =0a(14) =69623a(15) =0a(16) =0a(17) =255803a(18) =0a(19) =0a(20) =247141a(21) =0a(22) =0a(23) =3565979a(24) =0a(25) =0a(26) =6314447a(27) =0a(28) =0a(29) =4911311