Enigma 1180: Anomalies
15 February 2016
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From New Scientist #2336, 30th March 2002 [link]
SEVEN is a prime, and as one would expect, SEVEN minus THREE equals FOUR. But perversely, FOUR is a prime, (and is also a prime when the digits are in reverse order), so THREE is not a prime. Another anomaly is that TEN is a perfect square.
Each different capital letter above represents a different digit, which is the same for that letter everywhere.
Find the numerical values of FOUR and TEN.