" Pick a number between ten and a thousand. Don’t tell me what it is. [Thinks … 575] Add the digits together. [17] Add them again. [8] Add 3. [11] Subtract this from the original number. [564] Add the digits together. [15] Find the remainder left when you divide by nine. [6] Square it. [36] Add 6. [42] The number in your head now is … 42? [Yes!] Now try it once again… "
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![Greg Egan quote : Pick a number between ten and a thousand. Don’t tell me what it is. [Thinks … 575] Add the digits together. [17] Add them again. [8] Add 3. [11] Subtract this from the original number. [564] Add the digits together. [15] Find the remainder left when you divide by nine. [6] Square it. [36] Add 6. [42] The number in your head now is … 42? [Yes!] Now try it once again…](/image/2701978.jpg)