mlucas 17.1-3ubuntu2 (arm64 binary) in ubuntu focal

 mlucas is an open-source (and free/libre) program for performing Lucas-Lehmer
 test on prime-exponent Mersenne numbers, that is, integers of the form
 2 ^ p - 1, with prime exponent p. In short, everything you need to search for
 world-record Mersenne primes! It has been used in the verification of various
 Mersenne primes, including the 45th, 46th, 48th, 49th and 50th found Mersenne
 prime.
 .
 You may use it to test any suitable number as you wish, but it is preferable
 that you do so in a coordinated fashion, as part of the Great Internet
 Mersenne Prime Search (GIMPS) <https://www.mersenne.org/primes/>.