14th_cylon ,

This seems wrong…

10^17 milligrams

(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.

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