在条形图中显示x轴的大数字序列

While plotting bargraph i want to display label of large sequence of numbers for x-axis.I figured by using names.arg=c() .But for displaying large sequence of numbers such as from 1 to 50 in x -axis i have to type all the numbers such as names.arg=c("1","2","3","4"------"50").While plotting bargraph i want to display label