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 Square - both ways (Posted on 2018-07-28)
What is the smallest number (over 10) that becomes square if its reverse is added or subtracted to it?

Optional: list additional numbers with the above feature.

 No Solution Yet Submitted by Ady TZIDON No Rating

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The smallest number over 10 if both its reverse number added to it results in a square number and if its reverse number is subtracted from it results in a square number is 65.

65    :     65 +     56 =  11and
65 -     56 =   32

Some of the additional numbers with the feature are:
242   :    242 +    242 =  22and
242 -    242 =   02
20402 :  20402 +  20402 = 202and
20402 -  20402 =   02
24642 :  24642 +  24642 =
222and

24642 - 246422 =   02

621770: 621770 + 077126 = 8362 and
621770 - 077126 = 7382

 Posted by Dej Mar on 2018-07-28 10:34:31

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