Question 1173285
<pre>
You cannot use the backslash notation you are using on this site.  
What is that code anyway? UNIX?

I assume you mean:

P = {(x,y):(1,0), (2,4), (3,8), (4,12), ...}

P = {(x,y):(n,4(n-1))} for n=1,2,3,4,...

Is that what you want?  If not, answer at the bottom of this and I'll get back
to you by email.  No charge ever.

Edwin</pre>