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A115530
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Numbers n such that the square of n is the concatenation of two numbers m and 2*m.
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0
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5714285714285714286, 8571428571428571429, 11428571428571428572, 465116279069767441860465116279070, 511627906976744186046511627906977, 558139534883720930232558139534884, 604651162790697674418604651162791
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