This application illustrates the notion of an integer’s factors, and of the related property of integers called primeness, or primality. An integer is called prime if it is the product of only one distinct pair of integers. For example, 11 is prime because the only pair of integers whose product equals 11 is 1 and 11, as in 1*11 = 11 .

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Prime Time: Math Adventure is appropriately named Prime Time. In this mode blocks containing numbers constantly ascend the screen. The student must select blocks which represent factors of the product numbers on the screen. Prime Time exemplifies the fundamental theorem of arithmetic, also called the unique factorization theorem, which states that every positive non-prime integer can be written as a unique product of primes. As the student continues

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Finds the prime factors of positive integers, solves triangles and circles problems, manipulates complex numbers, does base conversions. Results can be saved or printed. Includes a help file with instructions, example and methodology.

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calculates the prime numbers 1..N, tells you if N is prime etc. Prints tables of primes. Computes the prime just below or above N. calculates the prime numbers 1..N, tells you if N is prime etc. It is useful in computing optimal HashTable sizes. Java source included.

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Math Functions, factorization, financal, currencies. Average, regression, factorial. Dates. Complexes (add, powers, products...). Chart y=f(x). Units converter. Planets ephemerids, Jupiter Satellites, Geometry (Euler, Simson...) Gravitation. Fourier Series. Pi decimals (10000), Chaotic Pendule, Solar System, Games (invaders, blocs, balls, billard...). Calendars, Molar Mass Calculation, Taylor expansion, Bernoulli, Gamma, Euler, Prime numbers...

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Prime Number Spiral (a.k.a. the Ulam Spiral) is constructed as follows: Consider a rectangular grid. We start with the central point and arrange the positive integers in a spiral fashion (anticlockwise). The prime numbers are then marked. There is a tendency for the prime numbers to occur on diagonal lines, however far out into the spiral one goes. This is software is for exploring the Prime Number Spiral. It also (a) allows coloring of the prime

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