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A116279
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Numbers k such that k*(k+2) gives the concatenation of two numbers m and m-1.
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4
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36363636363, 45454545454, 54545454545, 63636363636, 72727272727, 81818181818, 90909090909, 428571428571428571428, 571428571428571428571, 714285714285714285714, 857142857142857142857
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