Mnemonic game, you can improve your facilities of human mind concentration word and digital mnemonic memory. You needn't practice sophisticate exercises; it is just enough to study this training.

Test any number for primality with a single click. It uses a deterministic test and uses the Sieve of Eratophenes logic. Recommended on The Math Forum @ Drexel (University) for Middle School, High School and College, ages 6+. Only 99¢ per month.

Calculate the prime numbers between any two limits. It uses a deterministic test and uses the Sieve of Eratophenes logic. Recommended on The Math Forum @ Drexel (University) for Middle School, High School and College, ages 6+. Only 99¢ per month.

Calculate the factors of any number with a single click. Small application window allows simultaneous use with Word, Outlook, Excel, etc.. Recommended on The Math Forum @ Drexel (University) for Middle School, High School and College, ages 6+.

WordBanker is a unique and fun method of helping you to learn a foreign language. Rather than bog you down with complicated grammar it deals only with building a vocabulary.

Physics Cheat Sheet is an interactive physics package that helps students solve and visualize numerous physics equations.

The Prime Number Spiral (a.k.a. the Ulam Spiral) is formed by marking the prime numbers in a spiral arrangement of the natural numbers. This is software is for exploring the Prime Number Spiral.

Archim is a program for drawing the graphs of all kinds of functions. You can define a graph explicitly and parametrically, in polar and spherical coordinates, on a plane and in space (surface). Archim will be useful for teachers and students.

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