Can you find a relationship between the number of dots on the circle and the number of steps that will ensure that all points are hit? This group tasks allows you to search for arithmetic progressions in the prime numbers. A primary application is for choosing the key length of the RSA public-key encryption scheme.

What happens if you join every second point on this circle? Working on the building blocks will help you to explain what is special about your results. Black Box Age 16 to 18 Challenge Level: This black box reveals random values of some important, but unusual, mathematical functions.

How about every third point? Stars Age 11 to 14 Challenge Level: The RSA numbers were generated on a computer with no network connection of any kind. Follow this recipe for sieving numbers and see what interesting patterns emerge.

Age 7 to 11 Challenge Level: Use the interactivities to complete these Venn diagrams. Are they sticks, rectangles or squares?

A man has 5 coins in his pocket. Try with different steps and see if you can predict what will happen. Prime Sequences Age 16 to 18 Challenge Level: The RSA challenges ended in How many of the challenges will you discover for yourself? A weekly challenge concerning prime numbers. Progress in this Prime number and money challenge should give an insight into which key sizes are still safe and for how long.

Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.Every one digit prime number is strange and a number of two or more digits is strange if and only if so are the two numbers obtained from it by omitting either What's Left?

Age 5 to 7 Challenge Level. Nov 09, · Number Challenge (28 ratings) Loading Assignments are a Premium feature. Understanding how our ten number system works enables students to see interesting and useful patterns and relationships in these math activities.

Download all (5) Exercise: Find the Factors of Prime and Composite Numbers. Exercise: Place Value and the Thousands /5(28). Find the next big prime number, win cash and glory By participating in GIMPS, a distributed computing project to find Mersenne prime numbers, you could win $3, or more, not to mention.

A prime number (or a prime) is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product.

If you don't get a whole number, next try dividing it by prime numbers: 3, 5, 7, 11 (9 is divisible by 3) and so on, always dividing by a prime number (see table below).

Here is a. The RSA Factoring Challenge was a challenge put forward by RSA Laboratories on March 18, to encourage research into computational number theory and the practical difficulty of factoring large integers and cracking RSA keys used in ultimedescente.com published a list of semiprimes (numbers with exactly two prime factors) known as the RSA numbers, with a cash prize for the successful.

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