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The Number 181

181 is a Prime Number.

181 is a Centered Square Number.

181 is a Centered Pentagonal Number.

181 is a Centered 12-gonal Number.

181 is a Centered 18-gonal Number.

181 is a Centered 30-gonal Number.


The Year 181 AD

In the year 181 AD the volcano associated with Lake Taupo in New Zealand erupted.

In the year 181 AD Emperor Xian of Han China was born.

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