MY WORD processor has developed a fault. There鈥檚 one particular digit which it will not type: if you press the appropriate key absolutely nothing happens.
I can, for example, type the cube of 4 correctly, but not the square. Whereas for the larger number 7 8 (whose number of digits is less than the one-figure number I cannot type) I can correctly type both its cube and square.
Which digit do I keep missing out?
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Answer to Enigma 823
Double sum
645368