I mis-stated Friday's math puzzle. Find 2 consecutive numbers such that, when you add the digits of the first number, the sum is divisible by 7 and the sum of the digits of the second number is also divisible by 7. Sorry about that!
https://qz.com/935952/it-took-the-inventor-of-the-rubiks-cube-a-month-to-solve-his-own-puzzle/
New article about Erno Rubik.
http://www.puzzlesolver.com/puzzle.php?id=29;page=15 Very old article about Rubik.
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