317666domain: NAppears in sequencesa(n) = floor(n*phi^20), where phi is the golden ratio, A001622.at n=21A004935Numbers k that have 13 terms in their Zeckendorf representation.at n=7A179253Greatest k such that floor(k/r^n)=n, where r = golden mean = (1+sqrt(5))/2.at n=19A182615