Sierpinski's triangle in one line.

Depends on ASCII character set.

As expected for one-liners, most obfuscation has to do with reducing
the code size, including folding everything into a single for loop and
making a single library call to print the output.  But most important
of all: using a 1D cellular automaton to generate successive scanlines
of the triangle itself.

... then I renamed variables to "o" and "O"s for visual alliteration,
and added some prime numbers for kicks ^_^;

Actually, I only recently learned about this XOR trick, and I thought
it was totally fitting for a one-liner.  The line turns out to be
slightly longer than what most terminals would display, but it's still
few bytes shorter than the 2004 one-liner winner, so my entry should
also qualify as such.