Subscribe now

Dressed up to the nines

Hepta wrote down a three-digit number, Otto wrote down a larger number and Nonno wrote down a larger number still.

Hepta’s equalled 7 times a prime, Otto’s equalled 8 times another prime, and Nonno’s equalled 9 times another prime.

Between them, the three numbers used each of the digits 1-9 exactly once.

Furthermore, multiplying the three numbers together gave an answer which also used each of the digits 1-9 exactly once.

What were their numbers?

WIN £15 will be awarded to the sender of the first correct answer opened on Wednesday 17 June. The…

Sign up to our weekly newsletter

Receive a weekly dose of discovery in your inbox. We'll also keep you up to date with New Scientist events and special offers.

Sign up

To continue reading, subscribe today with our introductory offers

Piano Exit Overlay Banner Mobile Piano Exit Overlay Banner Desktop