%I #14 Sep 07 2017 12:16:36

%S 1,1,1,1,1,1,2,3,2,2,2,3,3,4,3,2,3,4,6,5,3,3,3,4,5,5,5,5,6,6,6,6,7,7,

%T 6,6,5,7,7,6,7,8,8,9,9,8,9,9,9,9,8,9,10,9,8,8,7,8,9,10,10,10,9,10,11,

%U 11,12,11,12,11,11,11,12,13,13,12,13,14,14,14

%N Number of primes in the interval [5n, 6n].

%H FUNG Cheok Yin, <a href="/A289496/b289496.txt">Table of n, a(n) for n = 1..10000</a>

%t Table[Count[Range[5n,6n],_?PrimeQ],{n,80}] (* _Harvey P. Dale_, Sep 07 2017 *)

%Y Cf. A035250, A289493, A289494, A289495, A289497, A289498, A289499, A289500.

%K nonn,easy

%O 1,7

%A _FUNG Cheok Yin_, Jul 07 2017