Find Armstrong Number in an Interval
Course- Python >
An Armstrong number, also known as narcissistic number, is a number that is equal to the sum of the cubes of its own digits. For example, 371 is an Armstrong number since 371 = 3*3*3 + 7*7*7 + 1*1*1.
Source Code
# Program to ask the user for a range and display all Armstrong numbers in that interval
# take input from the user
lower = int(input("Enter lower range: "))
upper = int(input("Enter upper range: "))
for num in range(lower,upper + 1):
# initialize sum
sum = 0
# find the sum of the cube of each digit
temp = num
while temp > 0:
digit = temp % 10
sum += digit ** 3
temp //= 10
if num == sum:
print(num)
Output
Enter lower range: 100 Enter upper range: 1000 153 370 371 407
Here, we ask the user for the interval in which we want to search for Armstrong numbers. We scan through the interval and display all the numbers that meet the condition. We can see that there are 4 three digit Armstrong numbers.