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Found: 5

What’s the sum of the Fibonacci numbers $F_{0} + F_{1} + F_{2} + . . . + F_{n}$ ?

What’s the sum $\frac{F_{2}}{F_{1}} + \frac{F_{4}}{F_{2}} + \frac{F_{6}}{F_{3}} + . . . + \frac{F_{18}}{F_{9}} + \frac{F_{20}}{F_{10}}$ ?

Is $F_{23}$ odd or even?

Is $F_{24}$ a multiple of $3$ ?

Let $n$ be a positive integer. Can $n^{7} - 77$ ever be a Fibonacci number?