**From New Scientist #1294, 25th February 1982** [link]

The answer to each of the subtraction sums in the above is the same positive number. Each letter stands for a different digit between 1 and 9 inclusive: none stands for zero.

Notice that I have not said that the numbers are expressed to the base 10. But they are all to the same base.

What is ICER in digits? And what is the base?

#### News

On 30th November 2011 (two years ago) I set up this site for sharing programmed solutions to **Enigma** puzzles. I started off with 5 puzzles from November 2011. Now there are 561 puzzles available on the site, including a complete archive of puzzles from December 2005 to date (8 years of puzzles), as well as the first 149 puzzles from the start of Enigma (February 1979 to February 1982 – 3 years of puzzles). All together the site currently covers 31.6% of all the Enigma puzzles published, and I’ll carry on putting up old and new puzzles as long as I can source them.

[enigma149]

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There are 4 different digits, so the smallest they can be is 1 to 4 in base 5, so we consider bases starting at 5. This Python program runs in 36ms.

Solution:The sums are expressed in base 9. ICER = 8135 in base 9 (which is 5945 in decimal).Congratulations to you, Jim, for completing two years on this site, today.

I wish you continued success in your Python programming career.

Greetings from Istanbul, Turkey.

Great site both fun and educational.