65 is the smallest number that becomes square if its reverse is either added to or subtracted from it.
65 + 56 = 121 = 11 x 11
65 - 56 = 9 = 3 x 3
(credit to the new Shelton wet/dry)65 is the smallest number that becomes square if its reverse is either added to or subtracted from it.
65 + 56 = 121 = 11 x 11
65 - 56 = 9 = 3 x 3
(credit to the new Shelton wet/dry)
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