This is a wonderful puzzle taken from the book “The Moscow Puzzles” by Boris A. Kordemsky. This book has a great collection of puzzles.
In this remarkable puzzle, each digit is a prime (2, 3, 5 or 7). No letters or digits are provided as clues, but there is only one solution. Find each of the digits in the multiplication below.
As always, please send your answers as comments within the blog (preferred), or send an e-mail to email@example.com. Please do share the puzzle with others if you like, and please also send puzzles that you have come across that you think I can share in this blog.
Happy cryptic days!