DAY 98:

Today’s Challenge

There are 2 rules to consider when calculating the NEXT number in our special sequence:

  •  if it’s EVEN, halve it
  •  if it’s ODD, add 1

For example, if starting at 50, the sequence would be:

  •  50    25    26    13    14    7    8    4    2    1

From 50, it takes 9 steps to eventually get down to 1.

Following the above rules, which starting number between 50 and 100 creates the most number of steps, 13 in all, when eventually arriving at 1?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 1st & 3rd rows of the playing board contain the following fourteen numbers:

2     9     13     14     15     22     25     36     40     42     45     66     72     80

Which three numbers, when trebled, are also present on the list?

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Answers

. . . can be found when clicking this.

7puzzleblog

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