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March 10th, 2018, 01:25 AM  #1 
Newbie Joined: Mar 2018 From: US Posts: 2 Thanks: 1  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?

March 22nd, 2018, 01:21 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,390 Thanks: 2015 
What is the square of 90909090910?

March 22nd, 2018, 03:24 PM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,152 Thanks: 1004 
Wanna close one? sqrt(570035570035) = 755006.999990728.... 

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copycopy, numbers, solving, trouble 
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