## vampire numberA natural number x that
can be factorized as y × z in such a way that the
number of occurrences of a particular digit in the representation of x
in a given base (say 10) appears the
same number of times in the representations in that same base of y
and z together. For example, 2187 is a vampire number since 2187
= 21 × 87 ; similarly 136948 is a vampire because 136948 = 146 ×
938. Vampire numbers are a whimsical idea that was introduced by Clifford
Pickover in 1995. ^{1}## Reference- Pickover, Clifford.
*Keys to Infinity*. New York: W. H. Freeman, 1995.
## Related category• TYPES OF NUMBERS | |||||

Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact |