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
Project Euler: Problem 9, Pythagorean numbers
Return the Fibonacci Sequence
Largest Twin Primes
Who has power to do everything in this world?
Find the maximum two numbers of every column of a matrix
Project Euler: Problem 14 Longest Collatz sequence(harder version)
Put m balls into n boxes (again)
Put m balls into n boxes
Return fibonacci sequence do not use loop and condition version 3
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