Indices of products of twin primes in the semiprimes.

Terms

a(0) =6a(1) =13a(2) =48a(3) =103a(4) =270a(5) =508a(6) =1001a(7) =1413a(8) =2724a(9) =3052a(10) =4859a(11) =5668a(12) =8029a(13) =9062a(14) =9608a(15) =12558a(16) =13828a(17) =17319a(18) =18823a(19) =22781a(20) =28077a(21) =40162a(22) =42359a(23) =48113a(24) =60703a(25) =71793a(26) =79161a(27) =83792a(28) =90129a(29) =94954