8thpentagonalnumber

<-- Enter pentagonal number statement
  

---

Calculate pentagonal number 8

The formula for pentagonal number n is as follows

Pn  =	n(3n - 1)
	2

Given n = 8, we have:

P8  =	8(3(8) - 1)
	2

P8  =	8(24 - 1)
	2

P8  =	8(23)
	2

P8  =	184
	2

P₈ = 92

---

Run Another Calculation