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

    1. Find the next three pentagonal numbers.

    2. What kind of sequence do the pentagonal numbers form?

    3. What is the equation for the nth pentagonal number?

13, 17, 21

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

t(n) = 4n − 3