Black Hole

Animated Image

This is an animated version of Stanislaw Ulam's prime spiral. The black dots are the prime numbers. In a zoom-out mode the number on the bottom-right corner is the number that will disappear next (the start of the sequence).

If this java applet does not start in your browser, you can click here. This method requires Java Web Start to be installed beforehand.


Clicking on the icons on the right side of the applet modify the behaviour of the applet.

Static Images

Spiral 1024x800 Image Triangular 1024x800 Image


Here is the source code.

Special thanks to Adys Japanese-Hungarian Dictionary for hosting this applet.

GNU (C) Gaspar Sinai 2008-04-29 Tokyo

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