Sunday Afternoon Maths LIII


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 Posted on 2016-05-29 

An Integral

Source: Alex Bolton (inspired by Book Proofs blog)
What is

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Lots of Ones

Is any of the numbers 11, 111, 1111, 11111, ... a square number?

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If you enjoyed these puzzles, check out Sunday Afternoon Maths LIX,
puzzles about square roots, or a random puzzle.
© Matthew Scroggs 2017