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 A350760 #8 Jan 05 2025 19:51:42
%S A350760 5,9,4,6,7,8,1,2,3,5,3,5,2,7,8,5,1,9,1,6,8,1,1,4,2,6,9,7,6,0,5,5,4,9,
%T A350760 3,7,6,0,3,6,3,9,4,6,9,6,1,0,2,4,2,4,3,7,9,0,5,1,1,2,5,6,8,9,5,7,9,4,
%U A350760 5,2,5,6,3,2,6,6,1,9,0,1,5,8,8,8,4,5,2,7,3,8,9,2,6,1,2,6,0,2,5,5,2,4,3,1,0
%N A350760 Decimal expansion of Pi/(2*sqrt(5)) * tan(Pi/(2*sqrt(5))).
%H A350760 Robert Frontczak, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Problems/ElemProbMay2020.pdf">Problem B-1267</a>, Elementary Problems and Solutions, The Fibonacci Quarterly, Vol. 58, No. 2 (2020), p. 179; <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Problems/FQElemProbMay2021.pdf">The Zeta Riemann Function and the Cotangent Function</a>, Solution to Problem B-1267 by Brian Bradie, ibid., Vol. 59, No. 2 (2021), pp. 179-180.
%F A350760 Equals Sum_{n>=1} zeta(2*n)*Fibonacci(2*n)/5^n (Frontczak, 2020).
%F A350760 Equals -1 + Sum_{n>=1} zeta(2*n)*Lucas(2*n)/5^n (Frontczak, 2020).
%F A350760 Equals Sum_{n>=0} 1/A273366(n).
%e A350760 0.59467812353527851916811426976055493760363946961024...
%t A350760 RealDigits[(Pi/(2*Sqrt[5]))*Tan[Pi/(2*Sqrt[5])], 10, 100][[1]]
%Y A350760 Cf. A000032, A000045, A062786, A244979.
%K A350760 nonn,cons
%O A350760 0,1
%A A350760 _Amiram Eldar_, Jan 14 2022