Armstrong number

Also known as narcissistic numbers, Armstrong numbers are the sum of their own digits to the power of the number of digits. As that is a slightly brief wording, let me give an example:

153 = 1³ + 5³ + 3³

Each digit is raised to the power three because 153 has three digits.

The  below code is used to find out the Armstrong numbers upto 2000. you can simply increase the value in {1..2000}

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for i in {1..2000};do echo $i | awk '{a=0;l=length($0);for(i=1;i<=l;i++){a+=$i^l}if(a>$0)exit}$0==a{print}' FS= ; done
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153
370
371
407
1634