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Science News
January 19, 2002
Ivars Peterson |
Computers by the Trillions A team of computer scientists and biochemists have demonstrated how a test tube of DNA molecules can compute on its own.   |
Science News
August 17, 2002
Ivars Peterson |
Testing for Divisibility Few people, including many mathematicians, know all the simple rules by which large numbers can be tested quickly for divisibility by numbers 1 through 12. Nonetheless, they can be handy for solving digital puzzles, reducing fractions, and as targets for algorithm development. |
Science News
November 15, 2003
Ivars Peterson |
Cool Rationals One of my more distinct recollections of math class involves the decimal representation of rational numbers and the discovery of wonderful patterns among those digits. A new paper finds fascinating new patterns and provides some numerological explanations. |
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
December 14, 2002
Ivars Peterson |
A Trillion Pieces of Pi Computer scientist Yasumasa Kanada and his coworkers at the University of Tokyo Information Technology Center have now succeeded in computing 1,241,100,000,000 decimal digits of pi, smashing their own previous world record of 206,158,430,000 digits, set in 1999. |
PC Magazine
October 19, 2004
Neil J. Rubenking |
Excel Fails to Store Credit Card Numbers When entering numeric data over 15 digits long, prefix the data with a single quote ('). This forces Excel to treat the data as text. |
