2005

• Prime Factors September 5
• Brain Teaser – Billiard Balls February 28

2004

• Google Billboard Problems July 29

2002

• Java Matrix Calculator June 13
• Prime Numbers March 18
• Krypto Game Analysis February 24

1997

• Javascript Linear Algebra Calculator August 1
• Linear Algebra Math August 1
• Solve a System of Linear Equations August 1