Guest Posted October 25, 2009 Report Share Posted October 25, 2009 A sequence {An} of positive integers is such that: A1 = 20, A2 = 30, and: An+2 = 3*An+1 – An, whenever n ≥ 1. Determine all possible positive integer value(s) of n such that: 1 + 5*An+1* An is a perfect square. Quote Link to comment Share on other sites More sharing options...
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A sequence {An} of positive integers is such that:
A1 = 20, A2 = 30, and:
An+2 = 3*An+1 – An, whenever n ≥ 1.
Determine all possible positive integer value(s) of n such that:
1 + 5*An+1* An is a perfect square.
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