This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A289496 #14 Sep 07 2017 12:16:36
%S A289496 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 A289496 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 A289496 11,12,11,12,11,11,11,12,13,13,12,13,14,14,14
%N A289496 Number of primes in the interval [5n, 6n].
%H A289496 FUNG Cheok Yin, <a href="/A289496/b289496.txt">Table of n, a(n) for n = 1..10000</a>
%t A289496 Table[Count[Range[5n,6n],_?PrimeQ],{n,80}] (* _Harvey P. Dale_, Sep 07 2017 *)
%Y A289496 Cf. A035250, A289493, A289494, A289495, A289497, A289498, A289499, A289500.
%K A289496 nonn,easy
%O A289496 1,7
%A A289496 _FUNG Cheok Yin_, Jul 07 2017