Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.


Sunday Afternoon Maths LIII

 Posted on 2016-05-29 

Lots of ones

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

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An integral

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

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If you enjoyed these puzzles, check out Advent calendar 2019,
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