Squarefree numbers n such that n^2 + 1 and n^2 - 1 are semiprime.

Terms

a(0) =30a(1) =42a(2) =102a(3) =462a(4) =2130a(5) =2802a(6) =3930a(7) =5658a(8) =6198a(9) =6270a(10) =6870a(11) =7458a(12) =7590a(13) =8970a(14) =9042a(15) =9858a(16) =10302a(17) =11490a(18) =11778a(19) =13710a(20) =13722a(21) =13998a(22) =14322a(23) =17490a(24) =17790a(25) =18042a(26) =19470a(27) =20478a(28) =22278a(29) =22962