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.
can you do better than this?
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
Write c^3 as sum of two squares a^2+b^2
Van Eck's Sequence's nth member
Divide elements by sum of elements
unique with nan
Modular multiplicative inverse
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