Prime numbers p such that p +- ((p-1)/2) are primes.

Terms

a(0) =5a(1) =13a(2) =73a(3) =421a(4) =541a(5) =613a(6) =661a(7) =673a(8) =1201a(9) =1453a(10) =2341a(11) =2473a(12) =2593a(13) =3061a(14) =3313a(15) =4441a(16) =4561a(17) =5113a(18) =6073a(19) =6121a(20) =6133a(21) =8521a(22) =8893a(23) =9601a(24) =9901a(25) =10453a(26) =11161a(27) =11701a(28) =12301a(29) =12721