The test suite does not check that the solution is a character string, but the problem definition requires that it should.
Added this check. (I messed it up a bit the first time I tried to do it, so sorry for some interim weirdness.)
str = num2str(A,formatSpec), could replace '
Invalid solution, really
New test suite invalidates this solution.
Which doors are open?
Project Euler: Problem 8, Find largest product in a large string of numbers
select the primes of a vector
Is it a number?
Replacing a row
Tune your guitar
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