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A Prime number has only two factors. For example, 29 can only be divided by 29 and 1 with no remainder. Number 1 is not considered to be a prime number. Although there are an infinite number of prime numbers only 46 of them are known up to now. The last prime number to be discovered took 75 computers to work it out and it is an astonishing 13 million digit figure.
Prime numbers from 1 to 30 expressed as Roman Numerals:
II (2), III (3), V (5), VII (7), XI (11), XIII (13), XVII (17), XVIIII (19), XXIII (23) and XXVIIII (29).
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