Prime numbers p such that p +- ((p-1)/6) are primes.

Terms

a(0) =37a(1) =181a(2) =397a(3) =757a(4) =829a(5) =1657a(6) =2089a(7) =2161a(8) =2341a(9) =3061a(10) =5077a(11) =6337a(12) =7057a(13) =7309a(14) =7561a(15) =8389a(16) =9109a(17) =9829a(18) =10369a(19) =10729a(20) =13789a(21) =17137a(22) =21061a(23) =21817a(24) =21961a(25) =23869a(26) =24517a(27) =24877a(28) =25237a(29) =26209