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
Make a checkerboard matrix
Project Euler: Problem 2, Sum of even Fibonacci
find radius of cone
Vectors counting by 2
Put m balls into n boxes (again)
Seperate array to small section according to its index position
Make an anonymous function that has variable output
Put m balls into n boxes
Return fibonacci sequence do not use loop and condition
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