A number v = x y with an even number n of digits formed by multiplying a pair of n/2-digit numbers (where the digits are taken from the original number in any order) x and y together. Pairs of trailing zeros are not allowed. If v is a vampire number, then x and y are called its "fangs." Examples of vampire numbers include 1260 | = | 21·60 1395 | = | 15·93 1435 | = | 35·41 1530 | = | 30·51 1827 | = | 21·87 2187 | = | 27·81 6880 | = | 80·86