Semiprimes of the form 2*n + 1, where n is a square.

Terms

a(0) =9a(1) =33a(2) =51a(3) =129a(4) =201a(5) =289a(6) =339a(7) =393a(8) =451a(9) =579a(10) =649a(11) =723a(12) =1059a(13) =1569a(14) =1923a(15) =2049a(16) =3043a(17) =3873a(18) =4609a(19) =4803a(20) =5001a(21) =5619a(22) =5833a(23) =6051a(24) =6499a(25) =6729a(26) =7201a(27) =7939a(28) =8193a(29) =9249