Three sisters
I have three aunts whose ages on their birthdays this year will each be a different prime. I would not dare to call them elderly, but at least one of them will be in her fifties. They were reminiscing that the last time their ages on their birthdays had all been prime in one year was 30 years ago, and on the occasion before that two of them had been in their teens.
鈥淚 wonder,鈥� one of them said, 鈥渋f we will be alive when it happens again?鈥�
鈥淚 don鈥檛 see why not,鈥� another replied, 鈥渇or it will happen before any of us reaches 80.鈥�
Advertisement
What will their ages be on their birthdays this year?
WIN 拢15 will be awarded to the sender of the first correct answer opened on Wednesday 6 October. The Editor鈥檚 decision is final. Please send entries to Enigma 1611, 快猫短视频, Lacon House, 84 Theobald鈥檚 Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).
Answer to 1605 Every month: (a) AUG (b) E L R T Y
The winner Allen Sawitz of Gadstrup, Denmark