Enigma 1627: A riddle for the sphinx
13 December 2011
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From New Scientist #2792, 25th December 2010 [link]
Those with a classical education will know that the sphinx was a riddle-setting monster associated with the Greek city of Thebes. I took the sum
ETA + BETA + THETA = DELTA
and replaced letters consistently with digits. Even if I told you the value of B, you still could not find all the digits, but if in addition I told you that PSI and PHI were prime, you could.