I like Piololgie, written by Sebastien Wedniewski. It looks like its only available on IOS (iPhone and iPad). The Piologie library is a very high performance library for doing multiprecision calculation. It does have, what appears to be, a very good factoring algorithm, though the documentation doesn't say what it is, but I'd bet something like the quadratic sieve. It calculates many standard constants (pi, Euler's constant gamma, etc.) to a *lot* of decimals, very quickly. Victor Here's the description from the app page. Piologie is a mathematical library to calculate with numbers of arbitrary precision. More details are available in the documentation (in German only). This iPhone App uses this library to provide the functions to factor large numbers and to calculate several thousand digits of mathematical constants. On Mon, Jul 8, 2013 at 2:19 PM, Robert Baillie <rjbaillie@frii.com> wrote:
I recently acquired an Android smart phone, and have been surpised at all the things it can do and the apps it can run.
I installed "Primality Test" by the Mincemeat team. This is the only prime testing app I could find that works with numbers of arbitrary precision. I didn't find any factoring apps that go beyond 10^18, and those appear to do factoring only by trial division. Are there better ones out there? (I'm already working on one for my own amusement, but I'd like to find a good one).
Just for fun, I installed a spectrum analyzer (Spectral Audio Analyzer by RadonSoft): it displays the frequencies in sounds that are picked up by the microphone.
What are your favorite math apps?
In particular, are there any calculators where you can type expressions (like "sqrt(-5) + sin(pi/7)^2") instead of just punching keys on a keypad?
Bob Baillie
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