Number of palindromic semiprimes less than 10^n.

Terms

a(0) =0a(1) =3a(2) =7a(3) =36a(4) =50a(5) =269a(6) =367a(7) =2181a(8) =2816a(9) =18391a(10) =23617a(11) =160773a(12) =203733a(13) =1429749a(14) =1788486a(15) =12808711a(16) =15889727