Don Shepherd is a well known calculator expert that usually posts in hpmuseum.org. This forum is populated mainly by scientific calculator users, with a couple of exceptions that also have a little place in their heart for other types of calculators. Don is one of them. In particular, Don’s interests include the HP17bII, of which the HP17bII+ is the latest version. For me, it is the best current financial calculator; and fighting with the HP19bII for the “best ever” title. And it is incredibly flexible with its solver.
The reason of this blog issue is an article from Don that I have read while looking for additional solver programs. You can find it here:
Some examples of what Don managed to extract from the programming capabilities of the HP17bII+:
This last one is below. A Zero result means the number is prime; any other number shows the first factor found.
fact = 0xL(j:0)+