Math: Pentagonal numbers) A pentagonal number is defined as n (3n-1) for n = 1,2,..., and so on. Therefore, the first few numbers are 1,5,12,22,...Write a methos with the following header that returns a pentagonal number:

public static int getPentagonalNumber (int n)

FOr example, getPentagonalNumber (1) returns 1 ans getPentagonalNumber (2) returns 5. Write a test program that uses this method to display the first 100 pentagonal numbers with 10 numbers on each line. Use the %7d format to display each number.