Romania 3
Source: IMO LongList 1959-1966 Problem 29
September 2, 2004
number theorySummationequationIMO ShortlistIMO Longlist
Problem Statement
A given natural number is being decomposed in a sum of some consecutive integers.
a.) Find all such decompositions for
b.) How many such decompositions does the number (where and are natural numbers) have? Which of these decompositions contain natural summands only?
c.) Determine the number of such decompositions (= decompositions in a sum of consecutive integers; these integers are not necessarily natural) for an arbitrary natural
Note by Darij: The is not considered as a natural number.