Program in C for 1 5 9 series upto 10th term

/* 1 5 9 series upto 10th term */
#include<stdio.h>
#include<conio.h>
void main()
{
    int a=1,i;
    i=1;
    do
    {
        printf("%d ",a);
        a+=3;
        i++;
    }
    while (i<=10);
    getch();
}