Semiprimes s such that both s + 3 and s - 3 are primes.

Terms

a(0) =10a(1) =14a(2) =26a(3) =34a(4) =86a(5) =106a(6) =134a(7) =194a(8) =226a(9) =254a(10) =274a(11) =314a(12) =334a(13) =386a(14) =446a(15) =566a(16) =974a(17) =1094a(18) =1126a(19) =1226a(20) =1234a(21) =1286a(22) =1294a(23) =1486a(24) =1546a(25) =1874a(26) =2066a(27) =2374a(28) =2386a(29) =2554