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 A206533 #21 Apr 21 2025 11:41:40 %S A206533 2,1,7,5,3,4,2,6,4,9,6,7,0,0,2,1,4,1,0,7,7,6,7,8,6,7,5,9,6,5,6,0,6,9, %T A206533 9,7,5,8,4,8,4,4,7,4,6,7,6,2,4,1,8,4,2,1,3,7,5,0,5,4,0,0,5,5,1,4,7,0, %U A206533 3,0,7,1,0,2,8,9,3,5,0,6,1,8,1,9,9,0,8,7,8,4,0,4,8,3,5,5,8,2,9,1,0,8 %N A206533 Decimal expansion of 1/(1-cos(1)). %C A206533 The value of the fractional limit of the numerators(A206531+2*A206532) and the denominators(A206532). %C A206533 Abs(A206532/(1-cos(1)) - (A206531+2*A206532)) -> 0. %D A206533 E. W. Cheney, Introduction to Approximation Theory, McGraw-Hill, Inc., 1966. %F A206533 Equals 1/(1-A049470). %F A206533 A206531/A206532+2 -> 1/(1-A049470). %F A206533 Equals 1/A371936. - _Hugo Pfoertner_, Apr 21 2025 %e A206533 2.17534264967002141077678675965606997584844... %t A206533 RealDigits[N[1/(1-Cos[1]), 150]][[1]] %o A206533 (PARI) 1/(1 - cos(1)) \\ _Stefano Spezia_, Apr 21 2025 %Y A206533 Cf. A002939, A082108, A206531, A206532, A049470, A371936. %K A206533 cons,nonn %O A206533 1,1 %A A206533 _Seiichi Kirikami_, Feb 11 2012 %E A206533 Incorrect a(86)=9 removed by _Georg Fischer_, Apr 04 2020