80
Voted
MOC
2002
15 years 23 days ago
2002
Abstract. We describe a successful search for a sequence of fifteen consecutive integers, each the product of exactly four prime factors. Fifteen is best possible.
117
Voted
ALGORITHMICA
1998
15 years 25 days ago
1998
Mallows and Riordan showed in 1968 that labeled trees with a small number of inversions are related to labeled graphs that are connected and sparse. Wright enumerated sparse connec...