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nialpdrome  and  pancake n.

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(max 15 digits)

First numbers that belong to both sets:

1, 2, 4, 7, 11, 22, 92, 211, 631, 742, 821, 862, 991, 3322, 6442, 7751, 9731, 9871, 66431, 77422, 86321, 88411, 88832, 986311, 8885221, 87655421, 777776521, 976621111, 87777776522.