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 A026313 #25 Jul 24 2021 08:34:56 %S A026313 0,1,3,4,6,7,10,13,14,16,17,19,20,22,23,25,26,28,29,32,35,36,38,39,41, %T A026313 42,44,45,47,48,50,51,54,57,58,60,61,63,64,66,67,69,70,72,73,76,79,80, %U A026313 82,83,85,86,88,89,91,92,94,95,98,101,102,104,105,107,108,110,111,113,114 %N A026313 Numbers k such that |sin(k)*sin(k+2)| < (sin(k+1))^2. %t A026313 Select[Range[120], Abs[Sin[ # ]*Sin[ # + 2]] < Sin[ # + 1]^2 &] (* _Stefan Steinerberger_, Apr 12 2006 *) %Y A026313 Cf. A117672. %K A026313 nonn %O A026313 1,3 %A A026313 _Clark Kimberling_ %E A026313 More terms from _Stefan Steinerberger_, Apr 12 2006 %E A026313 Missing a(1)=0 inserted by _Sean A. Irvine_, Sep 25 2019