Appendix

A-2: Arithmetic Calculations

Example A-2.3

$$ Determine if $2^9-1$ is a composite number or a prime. If it is composite, find its integer factors.   Solution Interactive Solution $$ •  Context Panel: Test Primality $2^9-1$$\stackrel{\text{check for prime}}{\to }$$\mathrm{false}$ •  Context Panel: Integer Factors $2^9-1$$\stackrel{\text{factor}}{\=}$$\left(7\right)\left(73\right)$ $$ Coded Solution   •  Test primality with the isprime command. >  $\mathrm{isprime}\left(2^9-1\right)$ •  Obtain integer factors with the ifactor command. >  $\mathrm{ifactor}\left(2^9-1\right)$   Note: After typing each command, press Enter to evaluate it. To save space in this ebook, we will frequently not show the output in the Coded Solution when it is the same as that in the Interactive Solution. $$

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