7 Aug 2013

Fibonacci Locker Code: Middle Secondary Mathematics Competition Question

Larry’s locker has a 4-digit security code. To help him remember it, he chose digits from consecutive numbers in the standard Fibonacci sequence (0, 1, 2, 3, 5 and so on). He noticed that two such 4-digit codes were also prime numbers. Larry chose the larger of the two.

What is the 4-digit code to Larry’s locker?




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