Question Number 139355 by Dwaipayan Shikari last updated on 26/Apr/21
$$\underset{{n}=\mathrm{0}} {\overset{\infty} {\sum}}\frac{{F}\left({an}\right)}{\left({an}\right)!}\:\:\:\:\:\:\:\:{F}\left({n}\right):={Fibbonacci}\:{Number} \\ $$
Commented by Dwaipayan Shikari last updated on 26/Apr/21
$${a}\:{is}\:{any}\:{kind}\:{of}\:{Number}\: \\ $$