DAY 308

Today’s Challenge

Follow the rules and eliminate every number from a given list, except one. Which one will be the last remaining?  From the even numbers in the range 2-40 inclusive, eliminate:

  • multiples of 4
  • single-digit numbers
  • numbers which are next to (one away from) a prime number or square number

Which is the only number that remains?


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

What is the product of the two prime numbers?



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