Square from primes
HARRY, Tom and I were looking to find 5-digit perfect squares that consisted of a 2-digit prime followed by a 3-digit prime, neither prime starting with a zero.
We each found a different example. My 2-digit prime was the same as Harry鈥檚 and my 3-digit prime was the same as Tom鈥檚.
Which square was found by (a) Harry, (b) Tom?
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拢15 will be awarded to the sender of the first correct answer opened on Wednesday 11 February. The Editor鈥檚 decision is final.
Please send entries to Enigma 1527, New 女生小视频, Lacon House, 84 Theobald鈥檚 Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).
The winner of Enigma 1521 is Louis Kennedy of Oslo, Norway.
Answer to 1521 Boat scenes
The speed of the pleasure boats travelling along the canal between Eastbridge and Westford is 8 kilometres per hour
