Linux shell编程求3位数水仙花数

#!/bin/bash
for ((a=1;a<10;a++))
do
    for((b=0;b<10;b++))
    do
        for((c=0;c<10;c++))
        do
             p=$((a*100+b*10+c))
             q=$((a**3+b**3+c**3))
             if [ $p -eq $q ];then
                 echo "$p"
             fi
         done
     done
done

linux log/cgj> ./narcis_number.sh
153
370
371
407