Semiprimes k such that k^2 - 7 and k^2 + 7 are also semiprime.

Terms

a(0) =82a(1) =142a(2) =214a(3) =254a(4) =326a(5) =358a(6) =386a(7) =478a(8) =538a(9) =542a(10) =566a(11) =674a(12) =758a(13) =802a(14) =974a(15) =1198a(16) =1366a(17) =1466a(18) =1594a(19) =1754a(20) =1762a(21) =1942a(22) =2302a(23) =2342a(24) =2374a(25) =2582a(26) =2654a(27) =2746a(28) =2762a(29) =2818