Smallest number m such that Sum_{k=1..m} 1/prime(k) >= n/6.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =4a(7) =6a(8) =10a(9) =16a(10) =29a(11) =59a(12) =140a(13) =400a(14) =1413a(15) =6467a(16) =40261a(17) =361139a(18) =4990906a(19) =114916199a(20) =4833601540