# Prime mystery

What's the mystery number?

The number *N* represents the first 6 digits of a special number. *N* consists of three prime numbers put side by side. These three prime numbers come *x*th, *y*th and *z*th on the list of primes, where *x*, *y* and *z* are themselves three consecutive primes (for example, *x*, *y* and *z* could be 3, 5 and 7, in which case we'd be looking at the third, fifth and seventh prime numbers). In addition, if *N* is split in the middle into two separate numbers, the prime factors of the left part of *N* add up to its right part. What is *N*? And what is the special number whose first 6 digits it forms?

*This puzzle was contributed by Aziz Inan, Professor of Electrical Engineering at the University of Portland. His own name, when written in capital letters, is a geometric word puzzle. Swap the vowels and turn the consonants 90 degrees and the words have switched places. "My parents didn't plan this," he says. "It's just fun."*

*If you have a puzzle you think might interest Plus readers, please email us!*

## Comments

## Ir's pi

pi=3.14159...

the primes are 31, 41 and 59, which form the 11th, 13th and 17th primes.

## pi

31, 41, 59 form 11, 13, 17 th primes and pi=3.14159...

## 314159 and pi

314159 and pi

## Wow..this is cool

Wow..this is cool