| 21. | Moves begin with the source square number, then a "-" or " x ", finally destination square number.
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| 22. | Unlike regular square numbers, which are never prime, quite a few of the centered square numbers are prime.
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| 23. | Some cube numbers are also square numbers; for example, 64 is a square number and a cube number.
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| 24. | It is also possible to play variants of this game using other allowed moves than the square numbers.
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| 25. | Some cube numbers are also square numbers; for example, 64 is a square number and a cube number.
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| 26. | Unlike regular square numbers, which are never prime, quite a few of the centered square numbers are prime.
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| 27. | Moves begin with the source square number, then a "-" or " x ", finally destination square number.
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| 28. | Thus, the number is a square number if and only if, in its canonical representation, all exponents are even.
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| 29. | The terms " square number " and " cubic number " derive from their geometric representation as a cube.
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| 30. | Fermat's right triangle theorem, named after Pierre de Fermat, states that no square number can be a congruent number.
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