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The Number 16811681 is a Square Number(41x41). 1681 is a Centered Octagonal Number. 1681 is a Centered 14-gonal Number. 1681 is a Centered 16-gonal Number.
1681 is a square and each of its two 2-digit parts is square.
The Year 1681 ADIn the year 1681 AD William Lilly, astrologer and translator of Trithemius, died.(Esoteric History)
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