Semiprimes formed by inserting a semiprime between the semiprime's ordered factors.

Terms

a(0) =393a(1) =2105a(2) =2147a(3) =3155a(4) =5255a(5) =5357a(6) =25829a(7) =26231a(8) =28241a(9) =29447a(10) =33913a(11) =35719a(12) =39331a(13) =56513a(14) =58517a(15) =59519a(16) =79113a(17) =210653a(18) =212261a(19) =214271a(20) =215879a(21) =216683a(22) =219497a(23) =314147a(24) =315953a(25) =317759a(26) =318361a(27) =320167a(28) =321973a(29) =323779