Numbers n such that 16^n + 1 is a semiprime.

Terms

a(0) =3a(1) =5a(2) =7a(3) =8a(4) =10a(5) =16a(6) =23a(7) =26a(8) =32a(9) =37a(10) =64a(11) =89a(12) =149a(13) =173a(14) =251a(15) =307a(16) =317a(17) =956a(18) =30197a(19) =46058