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Science News
May 21, 2005
Ivars Peterson |
Divisibility by Seven Over the years, people have come up with dozens of algorithms for divisibility by 7. Here is the latest entry that is fast and efficient for determining if large numbers are divisible by 7.   |
Science News
July 16, 2005
Ivars Peterson |
Closing the Gap on Twin Primes Euclid proved that the set of primes is infinite in size more than 2000 years ago, but no one has yet proved whether there is an infinite number of twin primes, or pairs of primes that have a difference of two. There's now hope that that matter will finally be resolved. |
Science News
April 10, 2004
Ivars Peterson |
From Number Puzzles to Automata Number puzzle leads to automata theory. |
Science News
February 24, 2001
Ivars Peterson |
Appealing Numbers It's amazing how much effort has gone into tracking down amicable numbers, which have practically no application in mathematics. They have a curious appeal that has endured for millennia... |
Science News
January 11, 2003
Ivars Peterson |
A Remarkable Dearth of Primes The pursuit of prime numbers -- integers evenly divisible only by themselves and 1 -- can lead to all sorts of curious results and unexpected patterns. In some instances, you may even encounter a mysterious absence of primes. |
