Padovan numbers that are semiprimes.

Terms

a(0) =4a(1) =9a(2) =21a(3) =49a(4) =65a(5) =86a(6) =265a(7) =1081a(8) =1897a(9) =2513a(10) =7739a(11) =97229a(12) =128801a(13) =299426a(14) =922111a(15) =1221537a(16) =2839729a(17) =62608681a(18) =338356945a(19) =53406819691