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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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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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 on the numbers will grow larger more complex forcing

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prime numbers between any two limits with a single click. Features: * Uses a deterministic test, * Uses the Sieve of Eratophenes logic, * Simple interface, type the start and end numbers and press enter, * Displays the result in decimal, * Displays the result in binary stars, * Dream ƒrequency "no-frills" style as described by Download.com editor, * Beeps to confirm primes calculated, * Small application window allows simultaneous use with Microsoft

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NUMBERS: natively supported plus functions (argument, norm, polar, imaginary, more). PRIME NUMBERS: verify primeness, identify next or previous prime. RANDOM NUMBERS: real or complex, linear or Gaussian. RATIONAL and FRACTIONAL numbers: input and output using ratios. GENERAL MATHEMATICS: modulo, remainder, percent, factorial, rounding, ceiling, floor... STATISTICS: group attributes (maximum, greatest common denominator, least common multiple, more

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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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