MathDB

30

Part of PEN O Problems

Problems(1)

O 30

Source:

5/25/2007
Determine the largest positive integer nn for which there exists a set SS with exactly nn numbers such that [*] each member in SS is a positive integer not exceeding 20022002, [*] if a,b∈Sa,b\in S (not necessarily different), then ab∉Sab\not\in S.