Hey Damocles,

Can I ask HOW you worked it out?

Was it just "mental gymnastics" or is there some kind of formula
or process or trick that can be followed for logically 'work out'
the answer?

Something general purpose that is.
I often come up with a series of numbers from various sources and 'wish'
I had a formula to produce them.

FYI - I am NOT looking for a lite-c solution here, Im looking for
general mathematical or analytical concepts.

If its hard to explain, I would be happy with some search-phrases so I can google it.

Thanks muchly dude...