PROC POWER: Find sample size for specified precision of confidence interval for single proportion?

[jsuebersax]

I'd like to use Proc Power to estimate a required sample size as follows:
Outcome is binary (Bernoulli trial).
Expected population success rate is 0.025.
What sample size will produce a 95% confidence interval for success rate with a width of 0.036 (half width = 0.018)?

Question: Can this be done with Proc Power and if so how? The CI method (exact, Wald, etc.) isn't important at this point.

Thanks for help!

--
John Uebersax

[StatDave]

Specify a wide range of sample sizes (ntotal=) and then whittle it down to find the desired sample size.

proc power;
   onesamplefreq ci
      halfwidth = 0.018
      proportion = 0.025
      ntotal = 110 to 120
      probwidth = .;
run;