HP 33s - Manual (Page 288)

17–6 Miscellaneous Programs and Equations
g
@
)  Retains P; prompts for I.
g
@
 )
 Retains 0.56 in I; prompts for N.
24 g
@
8

)
 Stores 24 in N; prompts for B.
g
#
/
.8

)
 Retains 5750 in B; calculates F,
the future balance. Again, the
sign is negative, indicating that
you must, pay out this money.
{%} 4  Sets FIX 4 display format.
Prime Number Generator
This program accepts any positive integer greater than 3. If the number is a prime
number (not evenly divisible by integers other than itself and 1), then the program
returns the input value. If the input is not a prime number, then the program returns
the first prime number larger than the input.
The program identifies non–prime numbers by exhaustively trying all possible
factors. If a number is not prime, the program adds 2 (assuring that the value is still
odd) and tests to see if it has found a prime. This process continues until a prime
number is found.