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nialpdrome  and  pentagonal n.

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(max 15 digits)

First numbers that belong to both sets:

1, 5, 22, 51, 70, 92, 210, 330, 532, 651, 852, 5551, 7740, 8400, 8855, 9322, 55200, 97410, 643210, 988610, 6664442, 9983310, 88631110, 99874320, 8888842110.