1sthexagonalnumber

<-- Enter hexagonal number statement
  

Calculate hexagonal number 1

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

Given n = 1, we have:
Hn = 1(2(1) - 1)
Hn = 1(2 - 1)
Hn = 1(1)
H1 = 1