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 A019986 #21 Feb 12 2025 06:45:21 %S A019986 2,8,6,3,6,2,5,3,2,8,2,9,1,5,6,0,3,5,5,0,7,5,6,5,0,9,3,2,0,9,4,6,4,2, %T A019986 5,0,7,7,9,5,1,7,1,0,3,2,3,1,5,2,0,2,5,5,9,7,8,3,8,1,9,6,0,8,9,7,1,3, %U A019986 5,6,2,0,4,0,8,1,1,3,6,5,3,4,9,8,0,9,3,6,9,2,6,5,7,6,2,7,9,0,7 %N A019986 Decimal expansion of tangent of 88 degrees. %C A019986 Also the decimal expansion of cotangent of 2 degrees. - _Ivan Panchenko_, Sep 01 2014 %C A019986 The least positive k such that floor(10^k tan 88°) is prime is k = 289 = 17^2. The sum of digits of the resulting prime is the prime 1279, whose sum of digits is the same as that of k, again a prime, 19. - _M. F. Hasler_, May 19 2023 %H A019986 Ivan Panchenko, <a href="/A019986/b019986.txt">Table of n, a(n) for n = 2..1000</a> %F A019986 Equals A019897 / A019811. - _R. J. Mathar_, Feb 12 2025 %t A019986 RealDigits[Tan[88 Degree],10,120][[1]] (* _Harvey P. Dale_, Aug 29 2016 *) %Y A019986 Cf. A019899 - A019987 (same for 1, ..., 89 degrees). %K A019986 nonn,cons %O A019986 2,1 %A A019986 _N. J. A. Sloane_