Number of divisors of prime(n)-1.

Terms

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