Fully multiplicative with a(p) = k if p is the k-th prime.

Terms

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