Category: matematikk

  • Er navnet mitt et palindromprimtall?

    Er navnet mitt et palindromprimtall?

    Jeg har tidligere skrevet om snodige tallfenomener som Snøballtall, Kvadratrotord, Kvadratrotord en gang til, Selvtall og Selvprimtall og om et navn kan være et primtall. “If you see someone’s name and you give each letter a value from 1 to 26 (a = 1, b = 2 etc.) and you add the numbers up in […]

  • En ny titt på det finurlige fenomenet “kvadratrotord”

    En ny titt på det finurlige fenomenet “kvadratrotord”

    Jeg blogga for en god stund siden om en matematisk finurlighet jeg leste om på futilitycloset.com, noe som de kalte root words. Jeg ga det da et norskt navn kvadratrotord. Jeg tror ikke det ordet finnes allerede. Av en eller annen grunn så fascinerte denne underlige egenskapen til tall og språk meg med en gang, […]

  • Self numbers and self primes

    In 1949 the Indian mathematician D.R. Kaprekar discovered a class of numbers called self-numbers. A number N is said to be a self number if it cannot be written as m + the sum of digits of m for any m. To find out if a given number is a self number, the idea is […]

  • 100 000 Pi (π) decimals vs. random numbers

    I have previously written a post about how I decided to visualize 100k decimals of Pi, Tau and e with Python. To do that I chose a simple set of three rules that was repeated for each decimal digit; For each of the decimals: First, draw a tiny square and fill it with a color […]

  • Visualizing 100k decimals of Pi, Tau and e with Python

    Visualizing 100k decimals of Pi, Tau and e with Python

    Having an interest for numbers, Linux and small scale programming and scripting shortens the route to test out things like this. It generally starts out with: “I wonder what that would look like” and ends in a continuous awe for numbers, programming and Linux. Having seen similar attempts to visualize numbers and an earlier attempt […]

  • A mathematical poem

    A mathematical poem

    When I read this mathematical poem by Leigh Mercer, I knew I had found a treasure: A dozen, a gross, and a scorePlus three times the square root of fourDivided by sevenPlus five times elevenIs nine squared and not a bit more. Here is another one: A mathematician named BenCould only count modulo ten.He said, […]

  • Create plasma-fractal wallpapers for your phone with ImageMagick

    Create plasma-fractal wallpapers for your phone with ImageMagick

    Do you like fractals? Do you like plasma? Perhaps both? Or do you simply like to fiddle with linux terminal commands? I know what I like, therefore I give you a one liner to create five awesome wallpapers for your phone: Download the samples here, but if you create them yourself, they will be your […]