%I #5 Jun 12 2024 17:36:27
%S 1,9,3,8,9,9,6,1,0,1,1,1,3,4,1,5,5,5,8,0,0,5,7,0,9,4,8,2,5,4,5,5,5,7,
%T 0,3,7,1,0,2,7,1,2,9,1,8,5,4,8,1,8,4,0,7,8,7,9,5,2,5,0,5,3,3,6,8,2,4,
%U 4,5,6,4,8,1,6,7,7,1,8,5,7,3,4,8,5,1
%N Decimal expansion of Sum_{k>=1} sin(Pi/k^2).
%e 1.9389961011134155580057094825455570371027129185481840...
%t s = Sum[Sin[Pi/k^2], {k, 1, Infinity}]
%t d = N[s, 100]
%t First[RealDigits[d]]
%Y Cf. A372838.
%K nonn,cons
%O 1,2
%A _Clark Kimberling_, Jun 07 2024