MathDB
marked number in segment 1999 cm - All-Russian MO 1999 Regional (R4) 10.8

Source:

September 25, 2024
combinatoricscombinatorial geometrynumber theory

Problem Statement

Some natural numbers are marked. It is known that on every a segment of the number line of length 19991999 has a marked number. Prove that there is a pair of marked numbers, one of which is divisible by the other.