perplexus.info :: Numbers : Squares built from leftovers

Squares built from leftovers (Posted on 2018-04-05)

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'.

Submitted by Ady TZIDON

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Solution: (Hide)

Answers: 134689, 961

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
re(2): Solution by cheating	Jer	2018-04-05 14:56:11
re: Solution by cheating	Charlie	2018-04-05 14:51:50
Solution by cheating	Jer	2018-04-05 14:33:51
computer solution	Charlie	2018-04-05 12:27:33

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