Number of divisors of the n-th nonprime.

Terms

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