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 A289499 #9 Jul 08 2017 12:17:27 %S A289499 0,1,0,0,2,1,2,2,2,2,2,4,3,1,2,3,4,3,3,4,3,5,4,4,2,5,6,6,5,5,6,7,6,4, %T A289499 6,5,5,6,6,6,7,7,8,7,7,7,8,7,8,9,9,11,9,9,9,10,10,8,8,7,8,8,7,8,9,9, %U A289499 11,11,13,12,12,13,13,14,13,13,13,12,12,13 %N A289499 Number of primes in the interval [8n, 9n]. %H A289499 FUNG Cheok Yin, <a href="/A289499/b289499.txt">Table of n, a(n) for n = 1..10000</a> %Y A289499 Cf. A035250, A289493, A289494, A289495, A289496, A289497, A289498, A289500. %K A289499 nonn,easy %O A289499 1,5 %A A289499 _FUNG Cheok Yin_, Jul 07 2017