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The Nigerian Advance Fee Scheme (also known internationally as "419" fraud after the section of the Nigerian penal code which addresses fraud schemes) is generally targeted at small and medium sized businesses, as well as charities. [Croll]
Dutch microscopy pioneer and naturalist Anton van Leeuwenhoek (16321723) ground a total of 419 lenses during his life. [Oakes] 419 is the smallest number which when divided by 2, 3, 4, 5, 6 and 7 leaves remainders of 1, 2, 3, 4, 5 and 6 respectively. It is also interesting to note that 419 is one less than the least common multiple of the first 7 integers. [Tryczak] 419 is a Sophie Germain prime, since 2 * 419 + 1 = 839, which is prime. Note that it is the 22nd Sophie Germain prime, and 22 = 2 * 11 is the product of two Sophie Germain primes. [Carmichael] 419, 41, and 19 are all primes. The reversals of 419, 41, and 19 are all semiprimes. [Poo Sung] Milligrams of potassium in onehalf cup cooked spinach. [Karcher] (419*2^{2n} + 1)/3 can never be prime. [Wesolowski]
(There are 5 curios for this number that have not yet been approved by an editor.)
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