HP 9g Graphing Calculator - Manual (Page 78)

E-78
RUN
When the message “ 1: A(N), 2 :S(N) ” appears on the display, you can
input a “ P ” value to specify the type of operation to be
performed:
1 for A(N) 2 for S(N)
(1) A = 5 , R = 4, N = 7 A (N) = A (7) = 20480
[ ] ( 5 Seconds )
1 [ ] 5 [ ]
4 [ ] 7