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Database of Number Correlations The purpose of this section is to discover unexpected connections between various material and occult phenomena. A great resource for mathematicians. Notable Events for over 2000 years of history: Discover unusual synchronicities in World History. 2500 plus pages.

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The Number 680: Properties and Meanings

Prime Factors of 680=2x2x2x5x17.

680 is a 26-gonal Number.

680 is a Tetrahedral Number.

680 is the smallest tetrahedral number that is also the sum of 2 Tetrahedral Numbers.

The Year 680 AD

In the year 680 AD...

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