Palindrome
A word, phrase, number, or other sequence of units that may be read the same way in either direction, forward or backward.
Square-root
A square root of a number A is a number y such that y^2 = A, or, in other words, a number y whose square (the result of multiplying the number by itself, or y × y) is A.
Others
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The mathematical reason for this is that once the solution 906609 is found it will no longer be possible to find a larger palindrome where the larger factor is less than the square-root of 906609 which is 952.160. from question Optimizing the largest palindrome from product of two three digit numbers? |