Number of distinct prime divisors of prime(n)-3.

Terms

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