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<990
Number Data-Base
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992>

The Number 991

991 is a Prime Number.

991 is a Centered 15-gonal Number.

991 is a Centered 18-gonal Number.

991 is a Centered 22-gonal Number.

991 is the maximal number of regions into which 44 lines divide a plane.


The Year 991 AD

In the year 991 AD...



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992>
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