The number of primes of the form i^2 + j^4 (A028916) <= 2^n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =5a(6) =7a(7) =11a(8) =17a(9) =28a(10) =43a(11) =67a(12) =108a(13) =173a(14) =272a(15) =434a(16) =690a(17) =1115a(18) =1772a(19) =2815a(20) =4528a(21) =7267a(22) =11646a(23) =18799a(24) =30378a(25) =48956a(26) =79270a(27) =128267a(28) =208509a(29) =338533