Micross #23
A prime specimen.
Did you know it’s impossible to make a sudoku square that consists entirely of crossed three-digit prime numbers? It’s true! Three-digit primes can only end in the digits 1, 3, 7, and 9. And no matter how you arrange things, a 3x3 grid has five “ending squares,” not four, so you run out of options.
Today’s micross is a different exercise in prime numerology. As ever, you can get prior microsses here.
Really enjoyed this micro-cross ! Similar to, but significantly easier than, Jane Street's puzzle from last month https://www.janestreet.com/puzzles/number-cross-4-index/