I don't know if it's a lot of work but it could be a good idea to add a Prime Numbers group 2 with more difficult problems. I think about beautiful Ned's problems (primes ladders, Longest prime diagonal, Twins in a window ...).
test cases are wrong.
please be more serious to accept problems.
it doesn't suit mathworks:(
Does all the leading solutions with the size below 10, use this ? Nice idea, but this doesn't improve the problem solving skills.
My logic is right but test cases are very hude numbers.... failed to evaluate...
You need to learn to avoid loops. You can use isprime on an array. In any case, your logic is wrong. You never test that b is prime.
As Guillaume pointed out, this solution doesn't test if the numbers in b are Mersenne primes, simply if they're less than 2^n-1, which is not the right criterion. Further, you concatenate the index of the loop (j, which goes from 1 to 1...), rather than a Mersenne prime to b.
Also, this problem is designed, as many of James's problems are, to fail by timeout unless vectorized solutions are used.
i have corrected the logic but plz can u tell me smthing about vectorized solutions...
u can also mail me on firstname.lastname@example.org
some tips: http://nl.mathworks.com/help/matlab/matlab_prog/techniques-for-improving-performance.html
Project Euler: Problem 7, Nth prime
Who is the smartest MATLAB programmer?
Volume of a box
Is this is a Tic Tac Toe X Win?
The 5th Root
Not square-free number sequence
Scrabble Scores - 10
Divisible by 3
Radiation Heat Transfer — View Factors (2)
Find the treasures in MATLAB Central and discover how the community can help you!
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Contact your local office