8thhexagonalnumber

<-- Enter hexagonal number statement
  

Calculate hexagonal number 8

The formula for hexagonal number n is as follows
Hn = n(2n - 1)

Given n = 8, we have:
Hn = 8(2(8) - 1)
Hn = 8(16 - 1)
Hn = 8(15)
H8 = 120