1stheptagonalnumber

<-- Enter heptagonal number statement
  

Calculate heptagonal number 1

The formula for heptagonal number n is as follows
Hn  =  n(5n - 3)
  2

Given n = 1, we have:
H1  =  1(5(1) - 3)
  2

H1  =  1(5 - 3)
  2

H1  =  1(2)
  2

H1  =  2
  2

H1 = 1