[Tutor] Primes on a two-dimensional plane in the form of a re ctangular spiral

[alan.gauld@bt.com]

---Interesting discourse on pattern generayion snipped----

> But I'm cheap and ignorant about generating functions still, 
> so I'll use Mathematica instead.  According to 
> Mathematica's RSolve function,
> 
>     a(n) = 2n(1+2n)
> ....
> My gosh.  I must learn how generating functions work, so that 
> I can see how in the world that worked.  *grin*

You do that Danny, me I'm off to buy a copy of Mathematica :-)
I didn't know it could do that kind of thing, cool!

Alan G.