Vampire number
Vampire number is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.
A Vampire number is a natural number with an even number of digits, that can be factored into two integers. These 2 factors are called the fangs, and must have the following properties:
- they each have half the number of the digits of the orginal number
- together they consist of exactly the same digits as the orginal number
- at most one of them has a trailing zero
An example of a Vampire number and its fangs: 1260 : (21, 60)
Task description:
- 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:
16758243290880, 24959017348650, 14593825548650
Note that a Vampire number can have more than 1 pair of fangs.
Cf: