Primes p = prime(n): such that p.n and n.p both are prime, where (.) indicates concatenation.

Terms

a(0) =661a(1) =1051a(2) =1999a(3) =2179a(4) =3433a(5) =3593a(6) =3719a(7) =4073a(8) =4591a(9) =4733a(10) =5449a(11) =5503a(12) =6079a(13) =6481a(14) =7109a(15) =7211a(16) =7489a(17) =8293a(18) =8513a(19) =9901a(20) =10273a(21) =10529a(22) =11821a(23) =12721a(24) =14107a(25) =14591a(26) =14879a(27) =15263a(28) =15877a(29) =18149