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A245532 Decimal expansion of b_3, a constant associated with the 3rd Du Bois Reymond constant.

%I A245532 #25 Feb 16 2025 08:33:23
%S A245532 0,1,7,3,2,7,1,4,0,5,4,7,3,6,6,9,9,1,2,8,8,0,8,3,1,8,9,8,6,9,0,6,7,3,
%T A245532 9,9,0,7,0,9,5,8,3,6,0,6,3,6,4,3,2,1,4,5,1,3,0,4,9,2,1,6,3,3,6,8,3,4,
%U A245532 6,0,0,3,2,4,2,1,6,7,2,6,3,1,2,7,4,1,2,3,4,3,8,3,0,6,2,0,3,9,5,0,3,2
%N A245532 Decimal expansion of b_3, a constant associated with the 3rd Du Bois Reymond constant.
%D A245532 Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 3.12 Du Bois Reymond Constants, pp. 238-239.
%H A245532 Vincenzo Librandi, <a href="/A245532/b245532.txt">Table of n, a(n) for n = 0..10000</a>
%H A245532 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/duBois-ReymondConstants.html">du Bois-Reymond Constants</a>.
%F A245532 b_3 = (-1/4)*(e^3 - 3*e - 12).
%F A245532 Equals 2*sum((-1)^(n+1)/(1+xi(n)^2)^(3/2), (n=1..infinity)), where xi(n) is the n-th positive solution to tan(x)=x.
%e A245532 0.017327140547366991288083189869067399070958360636432145130492163368346...
%p A245532 Digits:=100: evalf((-1/4)*(exp(3)-3*exp(1)-12)); # _Wesley Ivan Hurt_, Jul 26 2014
%t A245532 b3 = (-1/4)*(E^3 - 3*E - 12); Join[{0}, RealDigits[b3, 10, 101] // First]
%o A245532 (PARI) (12+3*exp(1)-exp(3))/4 \\ _Charles R Greathouse IV_, Jul 25 2014
%Y A245532 Cf. A224196.
%K A245532 nonn,cons,easy
%O A245532 0,3
%A A245532 _Jean-François Alcover_, Jul 25 2014