Number of distinct primes embedded in prime p(n).

Terms

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