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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] The position of the largest term ("mille") in a dictionary that lists the first thousand numbers alphabetically in French. [Beedassy] Big Bertha was a 419 mm howitzer used by Germany in the first world war. Largest n up to which Eulers famous polynomial n^2+n+41 generates primes or semiprimes only. [Gupta] 419 West is a traditional American restaurant in Roanoke, Virginia. In China, the number “419” is a codeword for “one night stand” because it's an approximate homonym for “for one night.” The 419th decade is the first that has exactly three brilliant years (4183, 4187, and 4189). [Gaydos]
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