Isn't "4 * a(1)" a more natural incarnation of pi than "2 * a(2^10000)"?
Jan
Index: bc.1
===================================================================
RCS file: /cvs/src/usr.bin/bc/bc.1,v
retrieving revision 1.32
diff -u -p -r1.32 bc.1
--- bc.1 17 Nov 2015 05:45:35 -0000 1.32
+++ bc.1 6 Oct 2017 12:10:47 -0000
@@ -332,7 +332,7 @@ the exponential function and
prints approximate values of the exponential function of
the first ten integers.
.Bd -literal -offset indent
-$ bc -l -e 'scale = 500; 2 * a(2^10000)' -e quit
+$ bc -l -e 'scale = 500; 4 * a(1)' -e quit
.Ed
.Pp
prints an approximation of pi.
