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March 10th, 2018, 01:25 AM   #1
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I'm having trouble solving a copycopy numbers

To get the copycopy of a positive integer, we write it twice without a space. For example, the copycopy of 2018 is 20182018. Is there a positive integer whose copycopy is a perfect square? If so, how many such positive integers can you find?
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March 22nd, 2018, 01:21 PM   #2
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What is the square of 90909090910?
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March 22nd, 2018, 03:24 PM   #3
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Wanna close one?
sqrt(570035570035) = 755006.999990728....
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