A pentagonal number is defined as n(3n-1)/2 forn = 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 pentagonalnumber:public static int getPentagonalNumber(int n)For example, getPentagonalNumber(1) returns 1 and getPentagonalNumber(2) returns 5. Write a test program that uses this method to display thefirst 100 pentagonal numbers with 10 numbers on each line. Use the %7d formatto display each number.

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.