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 Topic: perfect squares
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 A question about perfect squares 2018-02-04 From Jolyn:Find the smallest possible value of a whole number m if 648x m is a perfect squareAnswered by Penny Nom. U(n+1) = 2Un + 1 2011-05-22 From Cillian:In a certain sequence, to get from one term to the other you multiply by 2 and add 1, i.e. This is a difference equation of form: U(n+1) = 2Un + 1. prove that there is a maximum of 2 perfect squares in this sequenceAnswered by Claude Tardif. Two problems 2010-04-13 From Dorothy:1. Explain why the number 123, 456, 789, 101, 112 cannot be a perfect square. (Hint: What is the units digit?) 2. A substance doubles in volume every minute. At 9:00A.M., a small amount is placed in a container. At 10:00A.M., the container is just full. At what time was the container one-eighth full?Answered by Robert Dawson.

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