OFFSET
1,1
REFERENCES
Thomas Koshy, Fibonacci and Lucas Numbers with Applications, Volume 1, 2nd edition, Wiley, 2017, chapter 13.8, pp. 248-250.
FORMULA
Equals exp(-phi) + exp(phi-1), where phi is the golden ratio (A001622).
Equals 2*exp(-1/2)*cosh(sqrt(5)/2) = A249455*cosh(phi - 1/2). - Peter Luschny, Oct 22 2019
Equals A328344 / e. - Amiram Eldar, Feb 06 2022
EXAMPLE
2.053565111476510960344914661146965309320258644945918...
MAPLE
Digits := 100: 2*exp(-1/2)*cosh(sqrt(5)/2)*10^86:
ListTools:-Reverse(convert(floor(%), base, 10)); # Peter Luschny, Oct 22 2019
MATHEMATICA
RealDigits[Exp[-GoldenRatio] + Exp[GoldenRatio - 1], 10, 100][[1]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Amiram Eldar, Oct 22 2019
STATUS
approved