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 A163584 #11 Mar 31 2020 10:52:47 %S A163584 0,1,0,0,1,0,0,1,0,0,1,0,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0, %T A163584 0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,0,1,0,0,1,0,0,1,0,0,1, %U A163584 0,0,1,0,0,1,0,0 %N A163584 Number of singularities of tan(x) in integer intervals starting with (0,1). %F A163584 For n>0, a(A062389(n)) = 1. - _Michel Marcus_, Aug 07 2013 %e A163584 a(0) = 0 because tan(x) has no singularities in the interval (0,1). %e A163584 a(1) = 1 because tan(x) has one singularity in the interval (1,2). %Y A163584 Cf. A163581. %K A163584 nonn %O A163584 0,1 %A A163584 _A. Timothy Royappa_, Jul 31 2009 %E A163584 More terms from _Michel Marcus_, Aug 07 2013