Numbers n such that either prime(n-1) == -1 (mod n) or prime(n+1) == -1 (mod n) but not both.

Terms

a(0) =2a(1) =4a(2) =7a(3) =8a(4) =14a(5) =16a(6) =26a(7) =27a(8) =32a(9) =33a(10) =35a(11) =76a(12) =78a(13) =169a(14) =170a(15) =172a(16) =175a(17) =177a(18) =183a(19) =184a(20) =185a(21) =434a(22) =446a(23) =1054a(24) =1056a(25) =2638a(26) =2702a(27) =6468a(28) =15930a(29) =40069