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 A379855 #6 Jan 04 2025 23:22:31
%S A379855 8,0,1,6,9,6,2,3,1,8,8,3,6,9,4,2,1,5,4,2,5,9,7,4,3,6,8,6,7,1,4,0,6,1,
%T A379855 9,6,5,5,7,2,8,8,4,0,2,2,0,4,7,9,5,0,6,9,4,7,6,0,9,5,1,0,8,9,0,2,6,3,
%U A379855 0,3,1,3,7,6,4,9,1,6,5,8,1,1,4,6,0,4,6,4
%N A379855 Decimal expansion of Pi*BesselY(0,2)/2.
%D A379855 Jerome Spanier and Keith B. Oldham, "Atlas of Functions", Hemisphere Publishing Corp., 1987, chapter 44, equation 44:5:11 at page 426.
%F A379855 Equals Sum_{k>=1} (-1)^k*psi(k)/Gamma(k)^2, where psi denotes the digamma function (see Spanier and Oldham).
%e A379855 0.8016962318836942154259743686714061965572884022...
%t A379855 RealDigits[Pi*BesselY[0,2]/2,10,100][[1]]
%Y A379855 Cf. A000796, A019669, A283743.
%K A379855 nonn,cons
%O A379855 0,1
%A A379855 _Stefano Spezia_, Jan 04 2025