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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: ( Back to comment list | You must be logged in to post comments.)
re: Solution by cheating | Comment 3 of 4 |
(In reply to Solution by cheating by Jer)

For the second, you must mean A124683


Interesting they differ only in the third digit from the left.

  Posted by Charlie on 2018-04-05 14:51:50
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