## Teaser 2918: Prime multiplication

**From The Sunday Times, 26th August 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:

What is the answer?

[teaser2918]

## Jim Randell 10:47 am

on29 April 2019 Permalink |We can easily use the [[

`SubstitutedExpression()`

]] solver from theenigma.pylibrary to solve this puzzle.The following run file executes in 113ms.

Run:[ @repl.it ]Solution:The result of the multiplication is 25575.If the digit 1 were allowed, there would be a further 9 solutions (including one that does not have the digit 1 in the result).

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## GeoffR 1:58 pm

on29 April 2019 Permalink |LikeLike