Modular Menu - HP 40gs User Manual

hp40g+.book Page 51 Friday, December 9, 2005 1:03 AM
NEXTPRIME
PREVPRIME

Modular menu

ADDTMOD
Computer Algebra System (CAS)
NEXTPRIME(n) returns the smallest prime or pseudo-prime
greater than n.
Example
Typing:
NEXTPRIME(75)
gives:
79
PREVPRIME(n) returns the greatest prime or pseudo-prime
less than n.
Example
Typing:
PREVPRIME(75)
gives:
73
All the examples of this section assume that p =13; that
is, you have entered MODSTO(13) or
STORE(13,MODULO), or have specified 13 for Modulo
in CAS MODES screen (as explained on page 15-16).
Performs an addition in Z/pZ.
Example 1
Typing:
ADDTMOD(2, 18)
gives:
–6
ADDTMOD can also perform addition in Z/pZ[X].
Example 2
Typing:
ADDTMOD(11X + 5, 8X + 6)
gives:
6x 2 –
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