A perfect number occurs whent the sum of all divisors of a positive integer, except the number itself, equals the number.
28 = 1 + 2 + 4 + 7 + 14;
so return true
10 ~= 1 + 2 + 5
so return false
Least common multiple of many numbers
Multiples of a Number in a Given Range
Solve Sudoku puzzle step by
Put m balls into n boxes (again)
Put m balls into n boxes
Find the right number make the equation
Generate a vector like 1,2,2,3,3,3,4,4,4,4
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