7thheptagonalnumber

<-- Enter heptagonal number statement
  

Calculate heptagonal number 7

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

Given n = 7, we have:
H7  =  7(5(7) - 3)
  2

H7  =  7(35 - 3)
  2

H7  =  7(32)
  2

H7  =  224
  2

H7 = 112