I WAS recently filling in a passport application for my family and in writing down a particular year of birth for one of them I included an extra digit in error. The passport officer rejected the form but the quick-witted clerk noted that the five-figure “year” which I had written was a palindromic prime. Interestingly, the same was true if the form was read upside down.
What year had I intended to write?
A £10 book token will be awarded to the sender of the first correct answer opened on Thursday 16 February. The Editor’s decision is final. Please send entries to Enigma 799, Â鶹´«Ã½, King’s Reach Tower, Stamford Street, London SE99 0BB. The winner of Enigma 799 was Trevor Monk of Chepstow, Gwent.
Answer to Enigma 799
Advertisement
Going to great lengths
20 metres.
