1. Pentagonal Numbers Name: Exercise 11 1.java A pentagonal number is a number that fulfils the following formula for some positive integer n: p(n) = n (3n-1 ) Write a program that gets a number from the user and displays the first that many pentagonal numbers. Here's the header for the method to get you started: public static int pentagonalfint n) Sample Runs: Enter number: 10 p(1) 1 P (2) 5 P(3)12 P(4) 22 (5) = 35 p(7) = 70 p(8) = 92 P (9) 117 P (10) 145 Enter number: 5 P(3) 12 p (4) 22 PIS) 35