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Kaprekar n.  and  triangular n.

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(max 15 digits)

First numbers that belong to both sets:

1, 45, 55, 703, 4950, 5050, 499500, 500500, 49995000, 50005000, 4999950000, 5000050000, 499999500000, 500000500000, 49999995000000, 50000005000000.