High Quality Content by WIKIPEDIA articles! In mathematics, a vampire number (or true vampire number) is a composite natural number v, with an even number of digits n in a given base (usually decimal), that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains precisely all the digits from x and from y, in any order, counting multiplicity. x and y are called the fangs.For example: 1260 is a vampire number, with 21 and 60 as fangs, since 21 x 60 = 1260. However, 126000 (which can be expressed as 210 x 600) is not, as both 210 and 600 have trailing zeroes. Similarly, 1023 (which can be expressed as 31 x 33) is not, because although 1023 contains all the digits of 31 and 33, the list of digits of the factors does not coincide with the list of digits of the original number.

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