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Problem 1826. Find vampire numbers

Created by Andrew Newell

A vampire number is a number v that is the product of two numbers x and y such that the following conditions are satisfied:

  1. at most one of x and y are divisible by 10;
  2. x and y have the same number of digits; and
  3. The digits in v consist of the digits of x and y (including any repetitions).

If these conditions are met, x and y are known as "fangs" of v. For example, 1260 is a vampire number because 1260 = 21*60, so 21 and 60 are the fangs.

Write a function that returns all the vampire numbers in a given array. The output is a vector.

Example: disp(find_vampire(1000:2000) 1260 1395 1435 1530 1827

See also: Problem 1825. Find all vampire fangs and Problem 1804. Fangs of a vampire number.

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Solution Statistics

22 correct solutions 13 incorrect solutions
Last solution submitted on Aug 14, 2014

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