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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