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Problem #77

Prime Fangs

In mathematics, a vampire number is a composite natural number v, with an even number of digits n, that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains precisely all the digits from x and from y, in any order, counting multiplicity. x and y are called the fangs, e.g. 1260= 21\times60.

A prime vampire number is a vampire number whose fangs are its prime factors. 117067 = 167\times701 is the first prime vampire number. Calculate the 27th prime vampire number.

Contributed by Dhaval Kapil

Solved by 76 users

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