1stnonagonalnumber

<-- Enter nonagonal number statement
  

Calculate nonagonal number 1

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

Given n = 1, we have:
N1  =  1(7(1) - 5)
  2

N1  =  1(7 - 5)
  2

N1  =  1(2)
  2

N1  =  2
  2

N1 = 1