MathDB

321

Part of 1956 Moscow Mathematical Olympiad

Problems(1)

MMO 321 Moscow MO 1956 2-digit x , sum of digits same as 2x,3x,..,9x

Source:

8/19/2019
Find all two-digit numbers xx the sum of whose digits is the same as that of 2x2x, 3x3x, ... , 9x9x.
number theory2-digitsum of digits