MOC
2002
13 years 11 months 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.
ALGORITHMICA
1998
13 years 11 months 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...