Turns out that the part of the brain that is occupied with memorizing irrelevant illogical information such as random digits, is the same (pre-frontal cortex) part that is charged with exercising self control.

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He used a similar trick to memorize the precise order of 4, 140 random binary digits in half an hour.

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Tau, like pi, has infinitely many digits arranged in an apparently random order, so it's impossible to use them all.

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The random 18-digit code plus two check digits will have a four-digit prefix added and it will have intelligence in it.

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