Squares either way
Whether you write dates in the order day.month.year or month.day.year (in each case with two digits for each element), 04.04.01 represents 4 April 2001, and it is a square date because 40401 is the square of 201.
In addition to 4 April 2001, there is one other date in this century that is written in exactly the same way in each order and is also a square date. 1) What is that date? 2) What is the next date after today that is a square date if written in the order day.month.year? 3) What is the next date after today that is a square date if written in the order month.day.year? Give each answer in the form of 4 April 2001.
WIN £15 will be awarded to the sender of the first correct answer opened on Wednesday 13 November. The Editor’s decision is final. Please send entries to Enigma 1771, Â鶹´«Ã½, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).
Answer to 1765 Repeating digits: The sum of the numbers is 689
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The winner Dan Sattary-Javid of Reigate, Surrey, UK
