Sunday Times Teaser 2918 – Prime Multiplication
by Angela Newing
Published August 26 2018 (link)
Almost everyone knows that the single digit prime numbers are 2, 3, 5, and 7, the number 1 having been excluded quite a long time ago. Here is a multiplication involving prime digits
p | p | p | ||||
× | p | p | ||||
– | – | – | ||||
p | p | p | p | |||
p | p | p | p | |||
– | – | – | – | – | ||
p | p | p | p | p | ||
———— | — | — | — | — | — | — |
What is the answer?
Comments are closed.