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A334402 Decimal expansion of cosh(Pi). 3
1, 1, 5, 9, 1, 9, 5, 3, 2, 7, 5, 5, 2, 1, 5, 2, 0, 6, 2, 7, 7, 5, 1, 7, 5, 2, 0, 5, 2, 5, 6, 0, 1, 3, 7, 6, 9, 5, 7, 7, 0, 9, 1, 7, 1, 7, 6, 2, 0, 5, 4, 2, 2, 5, 3, 8, 2, 1, 2, 8, 8, 3, 0, 4, 8, 4, 6, 2, 6, 9, 6, 5, 5, 8, 2, 2, 3, 7, 3, 5, 3, 7, 5, 6, 0, 7, 5, 5, 5, 9, 7, 8, 5, 1, 4, 7, 2, 5, 1, 5, 2, 0, 3, 1, 4, 8, 4, 7, 5, 5 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

2,3

COMMENTS

This constant is transcendental.

LINKS

Table of n, a(n) for n=2..111.

Index entries for transcendental numbers

FORMULA

Equals Sum_{k>=0} Pi^(2*k)/(2*k)!.

Equals Product_{k>=0} (1 + 4/(2*k+1)^2).

Equals Product_{k>=1} (k^2 + 4)/(k^2 + 1). - Amiram Eldar, Aug 09 2020

EXAMPLE

(e^Pi + e^(-Pi))/2 = 11.5919532755215206277517520525601...

MATHEMATICA

RealDigits[Cosh[Pi], 10, 110] [[1]]

CROSSREFS

Cf. A000796, A001113, A039661, A068470, A073743, A093580, A175314, A308715, A323982, A334401.

Sequence in context: A306980 A063921 A346044 * A227574 A214869 A021632

Adjacent sequences:  A334399 A334400 A334401 * A334403 A334404 A334405

KEYWORD

nonn,cons

AUTHOR

Ilya Gutkovskiy, Apr 26 2020

STATUS

approved

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Last modified December 1 16:44 EST 2021. Contains 349430 sequences. (Running on oeis4.)