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Assuming you know how to do the first bit, the double sum can be written as follows.

2*sigma(sigma(expression,j,0,jmax),i,0,imax)

In order to add on an extra number to a list, use the augment function.

augment({1,2},{3}) produces
{1 2 3}

As for seeing if a number is divisible by any elements in the list, use the mod funct ...

I'm not sure how to do exactly what you are describing.

However, I have a viable alternative suggestion. Make the argument a list.

ie.

eqres(res)
Func
sum(res^-1)^-1
EndFunc

And to us ...

On the 89's you must type x * y to multiply x and y.
If you don't use the * it thinks you are calling the variable "xy"