20 through 26: 1 2 4 8 16 32 64.
bender:~ rone$ date -r 1248163264 Tue Jul 21 01:01:04 PDT 2009
Put it in your PDA and get ready to PAR-TAY.
Other options:
no subject
1/2 * SUM (5^-i)
Re: 1/2 * SUM (5^-i)