Prime numbers p such that p +- ((p-1)/3) are primes.

Terms

a(0) =991a(1) =2143a(2) =3331a(3) =4591a(4) =4663a(5) =5563a(6) =5653a(7) =8623a(8) =9181a(9) =9343a(10) =9631a(11) =12781a(12) =13033a(13) =13411a(14) =14851a(15) =15643a(16) =16183a(17) =16363a(18) =20161a(19) =20521a(20) =20593a(21) =23311a(22) =24373a(23) =25471a(24) =26641a(25) =27073a(26) =28711a(27) =30133a(28) =30763a(29) =32401