MathDB
Putnam 2017 B2

Source:

December 3, 2017
PutnamPutnam 2017

Problem Statement

Suppose that a positive integer NN can be expressed as the sum of kk consecutive positive integers N=a+(a+1)+(a+2)++(a+k1)N=a+(a+1)+(a+2)+\cdots+(a+k-1) for k=2017k=2017 but for no other values of k>1.k>1. Considering all positive integers NN with this property, what is the smallest positive integer aa that occurs in any of these expressions?