Problem 1826. Find vampire numbers

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 anyrepetitions).
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
Solve

Solution Stats

25.0% Correct | 75.0% Incorrect
Last Solution submitted on Jul 10, 2025

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factors number theory

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