5thnonagonalnumber

<-- Enter nonagonal number statement
  

---

Calculate nonagonal number 5

The formula for nonagonal number n is as follows

Nn  =	n(7n - 5)
	2

Given n = 5, we have:

N5  =	5(7(5) - 5)
	2

N5  =	5(35 - 5)
	2

N5  =	5(30)
	2

N5  =	150
	2

N₅ = 75

---

Run Another Calculation