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The Number 18011801 is a Centered Hexagonal Number.
1801 is a Centered 15-gonal Number.
The Year 1801 ADIn the year 1801 AD the Chemical Element Vanadium was first discovered by Andrés Manuel del Río, not verified until 1831.In the year 1801 AD the Chemical Element Columbium (later renamed Niobium) was first discovered by Charles Hatchett. In the year 1801 AD Robert Fulton produced the first submarine: The Nautilus. In the year 1801 AD Thomas Jefferson became president of the USA.
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