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house n.  and  tau n.

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(max 15 digits)

First numbers that belong to both sets:

1, 9, 25884, 56560, 146312, 495084, 5448560, 13413636, 22336896, 77205984, 85253400, 122210176, 147340880, 154833372, 254638176, 354256992, 409834800, 464970528, 603684992, 958696256.