Transmit Pi... precisely
Python, 138 bytes
q,r,t,i=1,180,60,2
while 1:u,y=27*i*(i+1)+6,(q*(27*i-12)+5*r)//(5*t);print(y,end=&quot;&quot;);q,r,t,i=10*q*i*(2*i-1),10*u*(q*(5*i-2)+r-y*t),t*u,i+1

Implementation of http://www.cs.ox.ac.uk/jeremy.gibbons/publications/spigot.pdf.