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What is the number of a vampire?
Definition. For example: 1260 is a vampire number, with 21 and 60 as fangs, since 21 × 60 = 1260 and the digits of the concatenation of the two factors (2160) are a permutation of the digits of the original number (1260).
What is vampire number in Java?
In mathematics, a vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, 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 …
Why is the number 1395 a vampire?
In this case, vampire numbers are numbers n which can be factorized using the digits of n. For example, 1395 = 5×9×31. A vampire prime or prime vampire number, as defined by Carlos Rivera in 2002, is a true vampire number whose fangs are its prime factors.
Who is the first vampire?
The first vampire started out as not a vampire at all, but as a human man named Ambrogio. He was an Italian-born adventurer who fate brought to Delphi, in Greece. You can read the full story here, but in a nutshell a series of blessings and curses transformed this young man into history’s first vampire.
What is the definition of a vampire number?
In mathematics, a vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, 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.
Do you have to have fangs to be a vampire?
These two factors are called the fangs, and must have the following properties: Print the first 25 Vampire numbers and their fangs. Check if the following numbers are Vampire numbers and, if so, print them and their fangs: Note that a Vampire number can have more than one pair of fangs.
How are vampire numbers similar to Pseudovampire numbers?
Pseudovampire numbers are similar to vampire numbers, except that the fangs of an n-digit pseudovampire number need not be of length n/2 digits. Pseudovampire numbers can have an odd number of digits, for example 126 = 6×21. More generally, you can allow more than two fangs.
What’s the vampire number with 21 and 60?
[Source Wiki] 1260 is a vampire number, with 21 and 60 as fangs, since 21 × 60 = 1260. 126000 (which can be expressed as 21 × 6000 or 210 × 600) is not, as 21 and 6000 do not have the correct length, and both 210 and 600 have trailing zeroes