Putnam 2015 B2
Source:
December 6, 2015
PutnamPutnam 2015
Problem Statement
Given a list of the positive integers take the first three numbers and their sum and cross all four numbers off the list. Repeat with the three smallest remaining numbers and their sum Continue in this way, crossing off the three smallest remaining numbers and their sum and consider the sequence of sums produced: Prove or disprove that there is some number in this sequence whose base 10 representation ends with