6thnonagonalnumber

<-- Enter nonagonal number statement
  

Calculate nonagonal number 6

The formula for nonagonal number n is as follows
Nn  =  n(7n - 5)
  2

Given n = 6, we have:
N6  =  6(7(6) - 5)
  2

N6  =  6(42 - 5)
  2

N6  =  6(37)
  2

N6  =  222
  2

N6 = 111