5thheptagonalnumber

<-- Enter heptagonal number statement
  

Calculate heptagonal number 5

The formula for heptagonal number n is as follows
Hn  =  n(5n - 3)
  2

Given n = 5, we have:
H5  =  5(5(5) - 3)
  2

H5  =  5(25 - 3)
  2

H5  =  5(22)
  2

H5  =  110
  2

H5 = 55