Numbers n such that the concatenations (2*n),(2*n-1) and (2*n),(2*n+1) give twin primes.

Terms

a(0) =21a(1) =39a(2) =51a(3) =54a(4) =90a(5) =96a(6) =135a(7) =150a(8) =156a(9) =165a(10) =171a(11) =195a(12) =210a(13) =261a(14) =270a(15) =306a(16) =330a(17) =411a(18) =420a(19) =441a(20) =501a(21) =570a(22) =615a(23) =636a(24) =741a(25) =771a(26) =816a(27) =885a(28) =1050a(29) =1095