MathDB
Putnam 1978 A1

Source: Putnam 1978

May 2, 2022
Putnamarithmetic sequence

Problem Statement

Let AA be any set of 2020 distinct integers chosen from the arithmetic progression 1,4,7,…,1001, 4, 7,\ldots,100. Prove that there must be two distinct integers in AA whose sum is 104104.
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