In this example, we will learn to find all the Armstrong numbers present in between two intervals in Python.
A positive integer is called an Armstrong number of order n if
abcd... = an + bn + cn + dn + ...
153 = 1*1*1 + 5*5*5 + 3*3*3 // 153 is an Armstrong number.
Visit this page to learn how you can check whether a number is an Armstrong number or not in Python.
# Program to check Armstrong numbers in a certain interval lower = 100 upper = 2000 for num in range(lower, upper + 1): # order of number order = len(str(num)) # initialize sum sum = 0 temp = num while temp > 0: digit = temp % 10 sum += digit ** order temp //= 10 if num == sum: print(num)
153 370 371 407 1634
Here, we have set the lower limit 100 in variable lower and upper limit 2000 in variable upper. We have used for loop to iterate from variable lower to upper. In iteration, the value of lower is increased by 1 and checked whether it is an Armstrong number or not.
You can change the range and test out by changing the variables lower and upper. Note, the variable lower should be lower than upper for this program to work properly.