### Home > A2C > Chapter Ch9 > Lesson 9.1.2 > Problem 9-43

9-43.

A sequence of pentagonal numbers is started below. Homework Help ✎

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?

13, 17, 21

Is a constant being added to each number to obtain the next? Multiplied? Neither?

*t*(*n*) = 4*n* − 3