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A115548
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Numbers k such that k^2 is the concatenation of two numbers m and 7*m.
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0
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91304347826086956521739130434782608695652173913043478261, 121739130434782608695652173913043478260869565217391304348, 152173913043478260869565217391304347826086956521739130435, 182608695652173913043478260869565217391304347826086956522
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