Encyclopedia > Thirteen

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Thirteen

Thirteen (13) is the natural number following twelve and preceding fourteen.

Thirteen is the 6th smallest prime number, the next is seventeen.

13 goes into 999,999 exactly 76,923 times, so fractions with 13 in the denominator have six digit repeating sequences in their decimal expansions.

Thirteen is also:



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Quadratic formula

... it.) The symbol <math>\pm \sqrt {b^2-4ac}</math> in the formula should be understood as "either of those element(s) of the field whose square equals b2 ...

 
 
 
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