# Sunday Times Teaser 2958 – Sudoku Crossword

*by Danny Roth*

#### Published June 2 2019 (link)

George and Martha are doing a mathematical crossword. There is a 3 x 3 grid with the numbers 1 to 9 inclusive appearing once each. The clues are as follows:

Across:

top line: a prime number

middle line: a prime number

bottom line: a prime number

Down:

left column: a perfect square

middle column: a perfect square

right column: a prime number

Although you do not need to know this, one of the diagonal three-digit numbers is also prime.

What is the sum of the three “across” numbers?

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A three stage permutation of the digits produced a much faster solution