Number of primes between 10n and 10n+9.

Terms

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