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repdigit numbers

A repdigit is a positive integer whose decimal digits are all identical. Single-digit positive integers are included.

The first few repdigit numbers are: 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, …

54 of the first one million positive integers are repdigit.

Learn more about repdigit numbers on wikipedia.

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