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A116275
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Numbers k such that k*(k+4) gives the concatenation of two numbers m and m-2.
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5
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8872, 9009, 83352840, 99000099, 329767122286, 670232877711, 738226276371, 933006600339, 999000000999, 3779410975143113, 3872816717528065, 4250291784692548, 4278630943941865, 4372036686326817, 4749511753491300
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