Primes p such that 2*p-1 and the concatenation of p and 2*p-1 are primes.

Terms

a(0) =2a(1) =367a(2) =661a(3) =691a(4) =997a(5) =1459a(6) =2011a(7) =2557a(8) =2707a(9) =3061a(10) =3967a(11) =4027a(12) =4177a(13) =4357a(14) =4639a(15) =5749a(16) =6211a(17) =6229a(18) =6961a(19) =7537a(20) =7561a(21) =7951a(22) =8191a(23) =8629a(24) =8689a(25) =9619a(26) =10789a(27) =10837a(28) =11311a(29) =12619