This week's GeekDad Puzzle of the Week is about perfect and almost perfect number pairs. Perfect numbers are numbers that equal the sum of their divisors. For example, the number 6 can be divided ...

You may know today, June 28, as Tau Day, a celebration of the number 2π, which some people believe to be the superior circle constant. I prefer to observe the most mathematically perfect day of the ...

Mona Lisa’s smile. Mary Lou Retton’s Olympic vault. Mariah Carey’s musical pitch. All are considered perfect. So are the numbers 6 and 28. With feats of artistry and athleticism, perfection lies in ...

Here is last week's puzzle, as originally posted: Perfect numbers are numbers that equal the sum of their divisors. For example, the number 6 can be divided evenly by 1, 2, and 3, and 6 = 1 + 2 + 3.