Call an integer a two-three integer if it is greater than 1 and has the form 2^a * 3^b, where a ≥ 0 and b ≥ 0.
Express 19992000 as a sum of two-three integers so that none of the addends divides another.

Source: Eighth Korean Mathematical Olympiad (Crux Math. Dec 1999)

(In reply to Analytic Solution by Brian Smith)

But 

Posted by Charlie on 2017-10-15 21:16:32