A371219 Decimal expansion of Product_{k>=1} (1 - 1/(2*k+1)^4).

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

Offset

0,1

Links

Table of n, a(n) for n=0..99.

Formula

Equals (1/8) * Pi * cosh(Pi/2).

Example

0.98535208438722062330349111379064867712159256...

Mathematica

RealDigits[(1/8) Pi Cosh[Pi/2], 10, 100][[1]]

Crossrefs

Cf. A003881, A175615, A258870, A369880, A371465.

Sequence in context: A318135 A119384 A243378 * A256165 A345737 A275703

Adjacent sequences: A371216 A371217 A371218 * A371220 A371221 A371222

Keyword

nonn,cons

Author

Ilya Gutkovskiy, Mar 31 2024

Status

approved