Given a year and a weekday, determine how many months of that year had five of those weekdays. It is kind of easy to find.
Example:
y = 2014 d = 'Sun'
result = 4
Find the peak 3n+1 sequence value
698 Solvers
145 Solvers
Given a 4x4 matrix, swap the two middle columns
282 Solvers
Sum the numbers on the main diagonal
353 Solvers
1354 Solvers
Solution 488823
Sorry for this little hack here... ;-)