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centered decagonal n.  and  pancake n.

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(max 15 digits)

First numbers that belong to both sets:

1, 11, 211, 781, 15401, 303811, 1125751, 22207781, 438094801, 1623331711, 32023604351, 631732398781, 2340843201061, 46178015265911, 910957680946951.