180 Days of Ideas for Discussion in Math Class.
(as of 9July2014, we're in overtime!)

Wednesday, March 19, 2014

65: Square Fibonacci Numbers

What are the only square Fibonacci numbers?
How can we show that these are the only ones?

1,144 only square Fib nmbrs. 1,3,21,55 only triangular Fib nmbrs. 2 only oblong Fib nmbr. 1,8 only cubes. (Weird!) Any tetrahedral beyond 1?
— James Tanton (@jamestanton) January 21, 2014

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