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 A359540 #18 Dec 31 2024 11:14:00 %S A359540 1,8,1,1,5,2,6,2,7,2,4,6,0,8,5,3,1,0,7,0,2,1,8,5,2,0,4,9,3,0,5,4,2,0, %T A359540 5,1,0,2,2,0,7,0,2,0,8,1,0,5,7,9,2,2,4,7,4,8,6,1,5,9,5,6,2,2,9,7,4,7, %U A359540 2,1,4,4,9,5,3,1,6,2,0,1,4,7,6,8,4,4,5,2,3,1,0,0,3,2,6,1,7,0,2,7,5,1,4 %N A359540 Decimal expansion of arccosh(Pi). %D A359540 Jerome Spanier and Keith B. Oldham, "Atlas of Functions", Hemisphere Publishing Corp., 1987, chapter 31, page 291. %H A359540 Michael I. Shamos, <a href="http://euro.ecom.cmu.edu/people/faculty/mshamos/cat.pdf">A catalog of the real numbers</a> (2011). %F A359540 Equals |arccos(Pi)|. %F A359540 Equals log(Pi + sqrt(Pi^2 - 1)) = log(A189089). - _Amiram Eldar_, Jan 05 2023 %e A359540 1.811526272460853107021852049305420510220702081057922474861595622974... %t A359540 RealDigits[Abs[ArcCos[Pi]], 10, 105][[1]] %o A359540 (PARI) -I*acos(Pi) \\ _Hugo Pfoertner_, Jan 24 2023 %Y A359540 Cf. A189089. %K A359540 cons,nonn %O A359540 1,2 %A A359540 _Wolfe Padawer_, Jan 05 2023