Question: A pentagonal number is defined as n(3n1)/2 for n = 1, 2, . . ., and so on. Therefore, the first few numbers are 1,

A pentagonal number is defined as n(3n–1)/2 for n = 1, 2, . . ., and so on. Therefore, the first few numbers are 1, 5, 12, 22, . . . .
Write a method with the following header that returns a pentagonal number:
public static int getPentagonalNumber(int n)
Write a test program that uses this method to display the first 100 pentagonal numbers with 10 numbers on each line.

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