Sunday Times Teaser 3145 – Easier To Ask The Audience
by Danny Roth
Published Sunday January 01 2023 (link)
“I have forgotten the phone number!” complained Martha, about to phone a friend. “So have I!” replied George, “but I have some vague memories of it. It is a perfect square with all the digits different, and the last digit is equal to the number of digits to be dialled. The last-but-one digit is odd and one of the digits is zero. Also the second and third and last-but-one digits are all exact multiples of the first digit. Maybe you can work it out.”
Martha proceeded to dial the number correctly.
What number did she dial?