9.
Take the twelve first prime numbers, 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, which have no factors but themselves and unity, and write down the value of their product, using no figures but 0, 1, 2, and 3, and of these using 2 and 3 only once.
Take the twelve first prime numbers, 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, which have no factors but themselves and unity, and write down the value of their product, using no figures but 0, 1, 2, and 3, and of these using 2 and 3 only once.