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A115544
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Numbers n such that the square of n is the concatenation of two numbers m and 6*m.
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0
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4, 142857142857142857142857142857142858, 285714285714285714285714285714285716, 142857142857142857142857142857142857142857142857142857142857142857142857142858
(list; graph; refs; listen; history; internal format)
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