Problem 44343. Pair Primes
there are quite a few look-up table solutions, could you perhaps add something like the following to the test suite to discourage these? assert(~any(cellfun(@(x)ismember(max([0,str2num(x)]),[51,2485,136162,8578934]),regexp(fileread('pairPrimes.m'),'[\d\.\+\-\*\/]+','match'))))
Do you consider (13, 31) and (31, 13) as the same or different pair primes? Similarly, how about (79, 97) and (97, 79)?
Thanks for pointing it out. They are different pair primes.
Good problem. At first, I thought we needed to reverse the numbers, but only their order is necessary. And we need to count twice numbers like 31 and 13.
Problem Recent Solvers98
Find the sum of the elements in the "second" diagonal
Numbers with prime factors 2, 3 and 5.
Reverse the elements of an array
More from this Author92
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!