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 A375771 #9 Aug 27 2024 09:13:05
%S A375771 1,2,9,3,2,7,7,3,9,9,3,7,5,3,6,9,2,0,3,3,3,3,3,7,9,6,7,1,7,8,8,4,3,9,
%T A375771 8,9,8,8,7,2,8,9,8,0,9,5,0,2,8,3,8,1,5,2,7,6,8,6,5,6,2,8,3,3,0,6,7,5,
%U A375771 5,7,2,9,3,5,8,9,6,4,9,4,5,1,2,5,5,7,4,9,3,0,9,8,7,3,2,8,5,4,6,8,4,2,2,4,7,3
%N A375771 Decimal expansion of the absolute value of the second derivative of the digamma function at 1/4.
%H A375771 Ernst D. Krupnikov and K. S. Kolbig, <a href="https://doi.org/10.1016/S0377-0427(96)00111-2">Some special cases of the generalized hypergeometric function _{q+1}F_q</a>, J. Comp. Appl. Math. 78 (1997) 79-95.
%F A375771 psi''(1/4) = -2*(Pi^3+28*zeta(3)).
%e A375771 psi''(1/4) = -129.3277399...
%p A375771 2*(Pi^3+28*Zeta(3)); evalf(%) ;
%t A375771 RealDigits[PolyGamma[2, 1/4], 10, 105][[1]] (* _Vaclav Kotesovec_, Aug 27 2024 *)
%Y A375771 Cf. A020777 (psi(1/4)), A282823 (psi'(1/4)).
%K A375771 nonn,cons
%O A375771 3,2
%A A375771 _R. J. Mathar_, Aug 27 2024