DAY 187

Today’s Challenge

A Keith Number, made famous by Mike Keith, is worked out in a not-too-dissimilar way to Fibonacci Numbers. If you like playing around with numbers, have a go at this fun concept.  The first 2-digit Keith Number, 14, is worked out as follows:

  • Try 14: 1+4=5; 4+5=9; 5+9=14 (the total arrives back to the original number).

By following this pattern, can you find the next 2-digit Keith Number?

Leave a comment below or e-mail me at if you get an answer!


The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from up to 84.

The 2nd & 3rd rows contain the following fourteen numbers:

8     13     17     25     28     36     42     45     48     55     63     64     66     80

Which three numbers, when 6 is added to them, each become multiples of 7?



. . . can be found when clicking this.


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