HP 40gs - Manual (Page 232)

14-50 Computer Algebra System (CAS)
IREMAINDER works with integers and with Gaussian
integers. This is what distinguishes it from MOD.
Example 2
Typing:
IREMAINDER(2 + 3·i, 1 + i)
gives:
i
ISPRIME? Returns a value indicating whether an integer is a prime
number. ISPRIME?(n) returns 1 (TRUE) if n is a prime or
pseudo-prime, and 0 (FALSE) if n is not prime.
Definition: For numbers less than 10 14 , pseudo-prime
and prime mean the same thing. For numbers greater
than 10
14 , a pseudo-prime is a number with a large
probability of being prime.
Example 1
Typing:
ISPRIME?(13)
gives:
1.
Example 2
Typing:
ISPRIME?(14)
gives:
0.
LCM Returns the least common multiple of two integers.
Example
Typing:
LCM(18, 15)
gives:
90
MOD See “MOD” on page 13-15.
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