Question 933903
<pre>
That's a geometric series
1+2+4+8+16+..., to 64 terms.

{{{S[n]}}}{{{""=""}}}{{{a[1](r^n-1)/(r-1)}}}

Substitute {{{a[1]=1}}}, {{{r=1}}}, {{{n=64}}}

{{{S[64]}}}{{{""=""}}}{{{1(2^64-1)/(2-1)}}}{{{""=""}}}{{{18446744073709551615}}}
grains of wheat, which would weigh about 5 trillion tons, which would be a pile
of wheat higher than Mount Everest. This is about 1000 times the annual world
production of wheat.

Edwin</pre>