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MOC
2002
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13 years 10 months ago
Fifteen consecutive integers with exactly four prime factors
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.
Tony Forbes
ALGORITHMICA
1998
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13 years 11 months ago
Linear Probing and Graphs
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...
Donald E. Knuth