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centered pentagonal n.  and  palindromic n.

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(max 15 digits)

First numbers that belong to both sets:

1, 6, 141, 181, 10401, 104474401, 193050391, 1357935397531, 1523729273251, 153434393434351, 181858898858181, 603297181792306, 620873909378026.