IMO Shortlist 1990 problem 1
Kvaliteta:
Avg: 0,0Težina:
Avg: 0,0 The integer
can be written as a sum of two consecutive integers:
Moreover, it can be written as a sum of (more than one) consecutive positive integers in exactly two ways:
Is there an integer that can be written as a sum of
consecutive integers and that can be written as a sum of (more than one) consecutive positive integers in exactly
ways?





Izvor: Međunarodna matematička olimpijada, shortlist 1990