Number of primes of the form x^4 + 1 less than 10^n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =8a(6) =13a(7) =18a(8) =27a(9) =45a(10) =70a(11) =111a(12) =180a(13) =308a(14) =491a(15) =790a(16) =1319a(17) =2231a(18) =3747a(19) =6396a(20) =10761a(21) =18291a(22) =30947a(23) =52611a(24) =89157a(25) =152514a(26) =260277a(27) =445869a(28) =762919a(29) =1307688