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Monthly Archives: September 2008
Decimal expansion zoo
In a comment on a previous post about rational numbers and decimal expansions, Steve Gilberg noted: I’ve been fascinated at how any multiple of 1/7 thatâ€™s not an integer repeats the same digits in decimal expression, only starting at different … Continue reading
Two Very Large primes
As promised, I can now reveal the identity of the two newly discovered Mersenne primes. The smaller of the two, discovered on September 6 by HansMichael Elvenich in Langenfeld, Germany, is an 11,185,272digit number which you can download here. The … Continue reading
New Mersenne primes!
The Great Internet Mersenne Prime Search just announced not one, but two new Mersenne primes! You might also recall the last time they announced a new prime, in September 2006, so these new primes were found almost exactly two years … Continue reading
Posted in computation, famous numbers, links, primes
Tagged announcement, discovery, GIMPS, Mersenne, prime
1 Comment
Rational numbers and decimal expansions
As you may remember from school, rational numbers have a terminating or eventually repeating (periodic) decimal expansion, whereas irrational numbers don’t. So, for example, 0.123123123123…, with 123 repeating forever, is rational (in fact, it is equal to 41/333), whereas something … Continue reading
Mandelbrot Maps
Run, don’t walk, to play with the Mandelbrot Maps applet, which lets you play around with the Mandelbrot set while seeing the associated Julia sets updated in real time. This fantastic applet was created by Iain Parris, an MSc student … Continue reading
Posted in fractals, links
Tagged applet, fractal, interactive, julia, mandelbrot, realtime
Comments Off on Mandelbrot Maps