Number of lines in Pratt certificate for n-th prime.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =4a(5) =4a(6) =2a(7) =4a(8) =6a(9) =6a(10) =6a(11) =4a(12) =4a(13) =8a(14) =8a(15) =6a(16) =8a(17) =6a(18) =8a(19) =8a(20) =4a(21) =8a(22) =6a(23) =6a(24) =4a(25) =4a(26) =6a(27) =8a(28) =4a(29) =6