6thhexagonalnumber

<-- Enter hexagonal number statement
  

Calculate hexagonal number 6

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

Given n = 6, we have:
Hn = 6(2(6) - 1)
Hn = 6(12 - 1)
Hn = 6(11)
H6 = 66