HP 40gs Manuel d'utilisateur télécharger pdf (Page 193)

100

101

Computer Algebra System (CAS) 14-11

Typing:

DEF(U(N) = 2N+1)

produces the result:

U(N) = 2N+1

Typing:

U(3)

then returns:

Example

Calculate the first six Fermat numbers F1...F6 and

determine whether they are prime.

So, you want to calculate:

for k = 1...6

Typing the formula:

gives a result of 17. You can then invoke the

ISPRIME?() command, which is found in the MATH

key’s Integer menu. The response is 1, which means

TRUE. Using the history (which you access by pressing the

SYMB key), you put the expression into the

Equation Writer with ECHO, and change it to:

Or better, define a function F(K) by selecting DEF from the

ALGB menu on the menu bar and type:

The response is and F is now listed amongst the

variables (which you can verify using the VARS key).

For K=5, you then type:

F(5)

Fk() 2

1+=

DEFFK() 2

1+=()

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HP 40gs Manuel d'utilisateur Page 193

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