Safe primes (A005385) (p and (p-1)/2 are primes) such that 8*p+1 (A023228) is also prime.

Terms

a(0) =5a(1) =11a(2) =107a(3) =179a(4) =347a(5) =479a(6) =1187a(7) =1307a(8) =1367a(9) =1487a(10) =1619a(11) =2027a(12) =2207a(13) =2447a(14) =2999a(15) =3119a(16) =3467a(17) =4007a(18) =4079a(19) =4139a(20) =4799a(21) =5087a(22) =5807a(23) =5927a(24) =5939a(25) =6827a(26) =7079a(27) =7247a(28) =8699a(29) =9587