confluent hypergeometric function

["David Joyner" <wdjoyner@gmail.com>]

Hi:

I have a question about hyperu(alpha,beta,x), documented in
http://pari.math.u-bordeaux.fr/dochtml/html.stable/Transcendental_functions.html#hyperu

Is this the same as $_1F_1(alpha,beta,x)$? The plot of
hyperu(1,1,x), 0<x<1, is different from the plot of
$_1F_1(1,1,x)$, 0<x<1, using Mma's online plotter
http://functions.wolfram.com/webMathematica/FunctionPlotting.jsp?name=Hypergeometric1F1

Any hints would be appreciated.

- David Joyner