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hex n.  and  nialpdrome

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(max 15 digits)

First numbers that belong to both sets:

1, 7, 61, 91, 331, 631, 721, 6211, 7651, 76321, 87211, 96661, 97741, 664111, 841111, 876421, 976411, 5431111, 8777431, 9553321, 987777511, 988866541, 87766666663321.