5thhexagonalnumber

<-- Enter hexagonal number statement
  

Calculate hexagonal number 5

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

Given n = 5, we have:
Hn = 5(2(5) - 1)
Hn = 5(10 - 1)
Hn = 5(9)
H5 = 45