DAY 292

Today’s Challenge

Following on from DAY 240, here’s another one of the unique Keith Number challenges made famous by Mike Keith and similar to Fibonacci numbers.  If you like playing around with numbers, you’ll love having a go at this fun concept.

The first 2-digit Keith Number14, is worked out by following a pattern:

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

The second 2-digit Keith Number19, is worked out in a similar way:

  • 1+9=10; 9+10=19 (the total again arrives back to the original number).

By following this pattern, the third and fourth 2-digit Keith Numbers are 28 and 47.  There are only two more below 100, what are they?



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

What is the sum of the square numbers?



. . . can be found when clicking this.


This entry was posted in Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *