Or something like this, even http://www2.wolframalpha.com/Calculate/MSP/MSP20811972138108...
(From http://www.wolframalpha.com/input/?i=Series[%28m0*c^2%29%2FS...] )
(From http://www.wolframalpha.com/input/?i=Series[%28m0*c^2%29%2FS...] )
http://www.wolframalpha.com/input/?i=population+of+japan+/+(...)