156
xkcd #2936: Exponential Growth
(imgs.xkcd.com)
Alt text:
Karpov's construction of a series of increasingly large rice cookers led to a protracted deadlock, but exponential growth won in the end.
(2^64−1) × 0.03 = 5.53 × 10^17 is weight in grams.
but i had an error in the second paragraph where i said this number is number of grains.
the ultimate result (712 times the annual production) is correct.
sorry for the confusion and thx for catching that.
Gotcha, I didn't catch that on my first read-through.