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A068812
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Numbers n such that n and its 10's complement are both triangular numbers; i.e. n and 10^k - n (where k is the number of digits in n) are triangular numbers.
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0
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45, 55, 990, 1485, 4005, 4950, 5050, 5995, 8515, 9180, 285390, 499500, 500500, 714610, 1719585, 3064050, 6935950, 8280415, 49000050, 49995000, 50005000
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