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Signed-digit binary expansion of Pi/4
1

%I #2 Mar 30 2012 17:23:26

%S 1,0,-1,0,1,-1,0,1,-1,0,0,0,1,0,0,0,0,0,-1,1,0,-1,1,-1,1,-1,1,-1,0,0,

%T 1,-1,0,0,1,-1,0,0,0,1,-1,1,0,-1,1,-1,0,0,1,0,-1,0,0,0,1,-1,0,0,1,0,

%U -1,1,-1,0,1,0,-1,0,0,1,-1,0,1,0,-1,0,0,1,0,-1,0,1,0,-1,0,0,1,-1,1,-1,0,0,1

%N Signed-digit binary expansion of Pi/4

%o (PARI) r=Pi/4; for(k=0,99,if(abs(r)<1/2,d=0,d=sign(r));r=2*(r-d);print1(d,", "))

%Y Cf. A004601, A155996.

%K base,sign

%O 0,1

%A _Jaume Oliver Lafont_, Jan 23 2009

%E Corrected and cross-reference added by _Jaume Oliver Lafont_, Feb 05 2009