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
Times 2 - START HERE
Number of 1s in the Binary Representation of a Number
Project Euler: Problem 8, Find largest product in a large string of numbers
Change the sign of even index entries of the reversed vector
Edges of a n-dimensional Hypercube
Number Puzzle - 046
Number Puzzles - 010
Number Puzzle - 070
Find the Pattern 5
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