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 A109237 #14 Feb 16 2025 08:32:58 %S A109237 1,2,3,5,6,7,9,10,11,13,14,15,17,18,19,21,22,23,24,26,27,28,30,31,32, %T A109237 34,35,36,38,39,40,42,43,44,45,47,48,49,51,52,53,55,56,57,59,60,61,63, %U A109237 64,65,66,68,69,70,72,73,74,76,77,78,80,81,82,84,85,86 %N A109237 a(n) = floor(n*coth(1)). %C A109237 Beatty sequence for coth(1) = (e^2+1)/(e^2-1) = 1.31303... = A073747; complement of A109238. %C A109237 From _Reinhard Zumkeller_, Aug 11 2009: (Start) %C A109237 a(n) = A164087(n) for n <= 20; %C A109237 a(n) = A109239(A109238(n)) and A109239(a(n)) = A109238(n). (End) %H A109237 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HyperbolicCotangent.html">Hyperbolic Cotangent</a> %H A109237 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BeattySequence.html">Beatty Sequence</a> %H A109237 <a href="/index/Be#Beatty">Index entries for sequences related to Beatty sequences</a> %Y A109237 Cf. A109238, A109239, A109231, A109234. %Y A109237 Cf. A073747. %K A109237 nonn %O A109237 1,2 %A A109237 _Reinhard Zumkeller_, Jun 23 2005 %E A109237 Typo in comment corrected by _Reinhard Zumkeller_, Aug 10 2009