Doddy -- I think the bottom row of y_correct in problem 4 (x = 7) is incorrect.
I have checked again and they are correct. By the way, the test cases have been checked by MathWorks before I can publish the problem. If you already get a generic formula for the previous cases, it should work for x=7 as well. Hint: There are two other mathematical constants involved in the solution.
I think when x=7,the y(7,1)is 62 not 61
Project Euler: Problem 10, Sum of Primes
Set some matrix elements to zero
Find the 9's Complement
Divisible by 9
Area Conversion 1
Number Puzzles - 002
Number Puzzles - 001
Number Puzzle - 039
Find the Pattern 7
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