A number v=xy 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 (1) 1395 = 15·93 (2) 1435 = 35·41 (3) 1530 = 30·51 (4) 1827 = 21·87 (5) 2187 = 27·81 (6) 6880 = 80·86 (7) ...