Primitives - Prime factors

v.2.4 Primitives, by Alec McEachran


Primitives represents numbers in terms of their prime factors, offering unusual insights into their structure. Numbers are presented as nested sets of small black dots. Three is presented as a blue circle enclosing three dots; a ‘set of three’. Six is presented as a set of three sets of two dots, or as a set of two sets of three dots.

When a number has many different prime factors, such as 30 = 3·2·5, the factors can be rearranged to offer different images of the same number.

Primitives is tailored for classroom use and perfectly suited for use with an interactive whiteboard.

Grid primitives combines the ‘Primitive’ visualisations with the Sieve of Eratosthenes. The Primitive visualisations of the first 42 numbers are arranged into a six column grid that is often used when finding prime numbers by elimination using the Sieve of Eratosthenes algorithm.

The visualisations are reduced in size to conform to the size of the grid, and behind them the pattern of multiples of 2, 3, 5 and 7 are each highlighted in the colour corresponding to the respective prime number. The prime numbers are particularly highlighted by an 11-pointed star behind each one.

The choice of a six column structure may lead students to question why after the bottom row, primes only appear in the first and fifth columns, or to put it mathematically, why all primes other than 2 and 3 are in the pattern 6n±1, where n is a positive integer, but that not all such numbers are prime. In each column, 25 and 35 disrupt the apparent pattern of primes. Studying this may lead students to futher questions about prime numbers for further study.



Copyright © ptolemy.co.uk / Copyright © Alec McEachran


Social Media Image Size Cheat Sheet for 2015 [INFOGRAPHIC]

Social Media Image Size Cheat Sheet for 2015 [INFOGRAPHIC]

Whether you’re brand new to social media or consider yourself a bonafide marketing ninja, setting up a new Twitter profile or Facebook Page can be a laboriously time-consuming process, especially when it comes to working out the sizes of all the images you need to make your channels – or those of your clients – stand out from the crowd.

And what about the other social platforms, like Google+, LinkedIn, Pinterest, Instagram or YouTube?

Wouldn’t it super convenient if somebody could put all of this information in just one, easy-to-read page?

Thankfully, help as it hand, via this quick and simple social media image size cheat sheet, which has been updated for 2015.


19:15 Posted by All Unicosmo Yotyrots Group in All Unicosmo Yotyrots Group, Internet | Permalink | Comments (0) | Tags: internet, info, social, media, image, size |  Facebook |


How to add all your friends at once the facebook group?

How to add all your friends at once the facebook group?

To add all your friends at once on a Facebook group you will need the browser like Google Chrome or Mozilla Firefox. In Google Chrome, open the page of your group and then open between the  link, press the CTRL + A keys, then select all, copy and return the page of your group Facebook and press CTRL + Shift + J keys and paste the code into the console and press enter. In Firefox, open the page of your group, and press CTRL + Shift + K keys on the console and paste the code and press enter. Now just wait until all your friends will be added to your group.


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