(11-22-2019 02:29 PM)rprosperi Wrote: (11-22-2019 01:36 PM)Logan Wrote: Perhaps I'm being dense but I'm not understanding how this progression works. Add the first two numbers and then some multiples of one of those numbers in a geometric sequence?

It's just long, written-out multiplication. It's probably been so long since anyone here has done math this way, no one recognizes it any more, lol.

Well now I feel sheepish. Seems obvious now that it's just the multiplication of the two numbers with all the stages in between!