Number of prime numbers of the form k^2 + k + 41 below 10^n.

Terms

a(0) =0a(1) =8a(2) =31a(3) =86a(4) =221a(5) =581a(6) =1503a(7) =4149a(8) =11355a(9) =31985a(10) =90940a(11) =261081a(12) =756081a(13) =2208197a(14) =6483148a(15) =19132652a(16) =56714624a(17) =168806741a(18) =504209234