8thheptagonalnumber

<-- Enter heptagonal number statement
  

Calculate heptagonal number 8

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

Given n = 8, we have:
H8  =  8(5(8) - 3)
  2

H8  =  8(40 - 3)
  2

H8  =  8(37)
  2

H8  =  296
  2

H8 = 148