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
Filter AC, pass DC
Rotate and display numbered tile
Set the array elements whose value is 13 to 0
Permute diagonal and antidiagonal
Sophie Germain prime
Compute the intersect point of line and plan
Return fibonacci sequence do not use loop and condition
If the number is Narcissistic number
Project Euler: Problem 14 Longest Collatz sequence(harder version)
Put m balls into n boxes
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