Write a program to print 20 terms of series 3n+2 .stop as soon as multiple of 4 is encountered. (N is user input).

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Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.

Try starting by do it manually for a few values of "n" - then write down the steps you took to do it, and follow those manually to see if they work.
When you have that, converting it to code should be fairly easy.

import java.util.Scanner;
class series
{
public static void main(String[] a)
{
Scanner sc=new Scanner(System.in);
System.out.println("Enter the value of n:");
int n=sc.nextInt();
int a=0;
for(int i=n; i<=n+20; i++)
{
a= 3*i+2;
if(a%4==0)
{
break;
}
System.out.println(a);
}
}
}