Calculate phi with bc and bash

#!/usr/bin/env bash
a=0 b=1
for((i=2;i<=23;i++));{
    c=$((a+b))
    printf "Fibonacci(%d) / Fibonacci(%d) = %.20f\n" $i $((i-1)) "$(bc -l<<<"$c/$b")"
    a=$b b=$c
}