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centered nonagonal n.  and  palindromic n.

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(max 15 digits)

First numbers that belong to both sets:

1, 55, 595, 5995, 617716, 3544453, 1264114621, 1634004361, 13953435931, 16048884061, 82078700787028, 539593131395935, 602224464422206, 636188414881636, 681909070909186, 683727232727386.