### Home > A2C > Chapter 9 > Lesson 9.1.2 > Problem 9-43

9-43.

A sequence of pentagonal numbers is started below.

Find the next three pentagonal numbers.

What kind of sequence do the pentagonal numbers form? What is the equation for the

*n*^{th}pentagonal number?Is a constant being added to each number to obtain the next? Multiplied? Neither?

What is the equation for the

pentagonal number?