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Squares built from leftovers (Posted on 2018-04-05) Difficulty: 2 of 5
Let N1=123456789
Erase n digits and shrink the remnants of N1 into one continuous chain creating a new number N1'.

What is the minimum number of digits to be erased so that N1' will be a square number?

Same question for N2=987654321 and N2'.

See The Solution Submitted by Ady TZIDON    
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Comments: ( You must be logged in to post comments.)
  Subject Author Date
re(2): Solution by cheatingJer2018-04-05 14:56:11
re: Solution by cheatingCharlie2018-04-05 14:51:50
Solution by cheatingJer2018-04-05 14:33:51
Solutioncomputer solutionCharlie2018-04-05 12:27:33
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