Centered 12-gonal numbers which are semiprimes, intersection of A003154 and A001358.

Terms

a(0) =121a(1) =253a(2) =793a(3) =1261a(4) =1441a(5) =1633a(6) =1837a(7) =2773a(8) =3601a(9) =3901a(10) =4213a(11) =4537a(12) =4873a(13) =5221a(14) =7141a(15) =9841a(16) =11881a(17) =14113a(18) =14701a(19) =16537a(20) =17173a(21) =17821a(22) =19153a(23) =19837a(24) =21241a(25) =22693a(26) =23437a(27) =24193a(28) =24961a(29) =28153