**From New Scientist #1984, 1st July 1995** [link] [link]

My word processor has developed a fault. There’s one particular digit which it will not type: if you press the appropriate key absolutely nothing happens.

I can, for example, type the cube of 4 correctly, but not the square. Whereas for the larger number 78 (whose number of digits is less than the one-figure number I cannot type) I can correctly type both its cube and square.

Which digit do I keep missing out?

#### News

Between the **Enigmatic Code** and **S2T2** sites there are now 3000 puzzles available.

On **Enigmatic Code** there are now 1658 **Enigma** puzzles available (which leaves 134 remaining to post). All 90 puzzles from the **Puzzle** series are available, as well as 215 from the **Tantalizer **series (and about 283 that are not yet posted). And we have all puzzles from the current **Puzzle #** series (which is ongoing, and most recently reached **Puzzle #213**).

And on the **S2T2** site there are currently 840 **Teaser** puzzles available (these are also ongoing, and has just reached **Teaser 3156**, so there are quite a lot of those remaining. But I have been working through the published books of puzzles and newspaper archives that are available).

Along with a few additional puzzles that brings the total to the magical 3000.

If you have been playing along with me and have solved all the puzzles posted so far, then well done! It has been quite a journey.

As long as I have the time I will keep posting puzzles to the sites. Thanks to those who have contributed to the site, either by sourcing puzzles or sharing their solutions.

Happy Puzzling,

— Jim

[enigma829]

### Like this:

Like Loading...

See also:

Enigma 1419,Teaser 1946.We first note that the puzzle contains the digits 4, 7, 8, so these cannot be the misbehaving digit.

The larger number (containing digits 7 and 8) has at least 2 digits, so the misbehaving digit must be 3 or more.

So the possibilities for the misbehaving digit are narrowed down to: 3, 5, 6, 9.

This Python program runs in 59ms. (Internal runtime is 679us).

Run:[ @replit ]Solution:The misbehaving digit is 6.The first number (“4”) is actually 664:

The cube of 664 is 292754944, which

does notcontain the digit 6, so can be typed correctly.And the square of 664 is 440896, which

doescontain the digit 6, so cannot be typed correctly.The second (larger) number (“78”) is actually 768:

The cube of 768 is 452984832, which

does notcontain the digit 6, so can be typed correctly.The square of 768 is 589824, which also

does notcontain the digit 6, so can also be typed correctly.Thanks for all the great times spent on working out solutions to the published puzzles.