4thhexagonalnumber

<-- Enter hexagonal number statement
  

Calculate hexagonal number 4

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

Given n = 4, we have:
Hn = 4(2(4) - 1)
Hn = 4(8 - 1)
Hn = 4(7)
H4 = 28