SE-SKOLORNAS 1973 Problem 2

The Fibonacci sequence $f_1,f_2,f_3,\dots$ is defined by $f_1=f_2=1$ , $f_{n+2}=f_{n+1}+f_n$ . Find all $n$ such that $f_n = n^2$ .

Dataset text AI-MO AoPS. Quoted with source.

Solutions

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