A379390 - OEIS

%I #5 Dec 22 2024 16:27:02

%S 2,2,7,8,2,9,1,6,4,1,4,4,0,4,3,7,5,4,3,6,6,1,4,9,2,5,7,0,7,1,7,4,7,6,

%T 3,0,9,1,5,0,5,9,7,4,3,2,7,4,9,6,9,9,5,5,1,8,6,0,0,2,6,7,0,9,9,9,2,3,

%U 2,7,1,9,5,2,7,3,8,0,8,5,0,2,5,8,9,1,0,9,9,9,3,7,2,9,4,4,9,6,1,5

%N Decimal expansion of 1/A240969.

%D Steven R. Finch, Mathematical Constants, Encyclopedia of Mathematics and its Applications, vol. 94, Cambridge University Press, 2003, Section 8.4.1, p. 493.

%e 2.2782916414404375436614925707174763091505974327...

%t phi = ArcSin[1/6 + (4/3)*Sin[(1/3 )*ArcSin[17/64]]]; psi = ArcTan[(1/2)*Sec[phi]]; beta = (1/2)*(Pi/2 - phi - 2*psi + Tan[phi] + Tan[psi])^(-1); RealDigits[1/beta, 10, 100] // First (* after _Jean-François Alcover_, Sep 04 2014 in A240969 *)

%Y Cf. A240969.

%K nonn,cons

%O 1,1

%A _Stefano Spezia_, Dec 22 2024