Belatedly posted by permission of Michael Reid. Enjoy!

Here are some New Year’s puzzles to help start out 2018.

1. Arrange the ten digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 in the

expression to make 2018.2. (a) Express where p, q, r, s are primes.

(b) Express where p, q, r, s are primes.3. (a) Is it possible to put the first 9 primes, 2, 3, 5, 7, 11, 13,

17, 19 and 23 into a 3×3 matrix that has determinant 2018?

(b) Is it possible to put the first 16 primes, 2, 3, 5, … , 53,

into a 4×4 matrix that has determinant 2018?4. (a) Express 2018 = A / B using the fewest number of distinct

digits.

For example, the expression 7020622 / 3479 uses only seven

different digits. But it is possible to do better than this.

(b) Express using the fewest number of distinct digits.