perplexus.info :: Numbers : Double number digit sum

Double number digit sum (Posted on 2024-01-16)

N is the smallest positive integer such that the sum of the digits of N is 18 and the sum of the digits of 2N is 27. Find N.

No Solution Yet Submitted by Danish Ahmed Khan

Rating: 4.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

Computer solution

| Comment 2 of 3 |

N: 1449 1+4+4+9 = 18

2N: 2898 2+8+9+8 = 27

--------------

def sod(n):

""" Input an integer. Returns the Sum of the Digits """

aList = list(str(n))

ans = 0

for c in aList:

ans = ans + int(c)

return ans

for n in range(10000):

if sod(n) == 18 and sod(2*n) == 27:

print(' N:',n, '\n', '2N:', 2*n)

break

Posted by Larry on 2024-01-16 08:21:56

Please log in:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (12)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info