HP 48gII - Manual (Page 181)

Page 5-10
of functions that apply to specific mathematical objects. This distinction
between sub-menus (options 1 through 4) and plain functions (options 5
through 9) is made clear when system flag 117 is set to SOFT menus.
Activating the ARITHMETIC menu („Þ ), under these circumstances,
produces:
Following, we present the help facility entries for the functions of options 5
through 9 in the ARITHMETIC menu:
DIVIS:
FACTORS:
LGCD (Greatest Common Denominator): PROPFRAC (proper fraction)
SIMP2:
The functions associated with the ARITHMETIC submenus: INTEGER,
POLYNOMIAL, MODULO, and PERMUTATION, are the following:
INTEGER menu
EULER Number of integers < n, co -prime with n