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 A371745 Decimal expansion of Sum_{k>=0} (-1)^k * k / ((k+1) (2k)!). 1

%I #20 May 03 2024 15:19:39

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

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

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

%N Decimal expansion of Sum_{k>=0} (-1)^k * k / ((k+1) (2k)!).

%F Equals 2 - cos(1) - 2 sin(1).

%e -0.2232442754839327307059412507035746029774...

%t s = Sum[(-1)^k k/((k + 1) (2 k)!), {k, 0, Infinity}]

%t d = N[s, 100]

%t First[RealDigits[d]]

%Y Cf. A372339, A372340.

%K nonn,cons

%O 0,1

%A _Clark Kimberling_, May 01 2024

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Last modified August 9 21:50 EDT 2024. Contains 375044 sequences. (Running on oeis4.)