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Changing Pure Function in Module

Hi All,

thank you to all who continue to respond to all of my questions ... and there
are always plenty of them.

I have the following function embedded in the findD code below.

a[1] =5;

a[n_]:= a[n] = (-1)^(n+1) (Abs[a[n-1]]+2)


I would like to change the pure function to use the following (cleaner) function
that requires no starting value (and starts for n = 1).

a[n_]:= a[n]= (-1)^(n+1)*(2n + 3)

Also, it would be important to test n prior to calling findD.  If n is a perfect
square, findD will "never" converge.  Is there a simple way to test if n is
square and tell the user ... try again ... n is a perfect square.

Again thank you for all of the help ... Wilson

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