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Computer Algebra System (CAS) 14-51
NEXTPRIME NEXTPRIME(n) returns the smallest prime or pseudo-prime
greater than n.
Example
Typing:
NEXTPRIME(75)
gives:
79
PREVPRIME PREVPRIME(n) returns the greatest prime or pseudo-prime
less than n.
Example
Typing:
PREVPRIME(75)
gives:
73
Modular menu
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).
ADDTMOD 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–
hp40g+.book Page 51 Friday, December 9, 2005 1:03 AM