/usr/share/applications/screensavers/sierpinski.desktop is in xscreensaver-data-extra 5.15-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=Sierpinski
Exec=/usr/lib/xscreensaver/sierpinski -root
TryExec=/usr/lib/xscreensaver/sierpinski
Comment=This draws the two-dimensional variant of the recursive Sierpinski triangle fractal. See also the "Sierpinski3D" screen saver. http://en.wikipedia.org/wiki/Sierpinski_triangle Written by Desmond Daignault.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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