# How to find keith numbers using Python?

PythonProgramming

You can use the following code to find if a number is a keith number in python −

## Example

def is_keith_number(n):
# Find sum of digits by first getting an array of all digits then adding them
c = str(n)
a = list(map(int, c))
b = sum(a)

# Now check if the number is a keith number
# For example, 14 is a keith number because:
# 1+4 = 5
# 4+5 = 9
# 5+9 = 14

while b < n:
a = a[1:] + [b]
b = sum(a)

return (b == n) & (len(c) > 1)
print(is_keith_number(14))

## Output

This will give the output −

True
Published on 20-Apr-2018 08:56:09