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A048935
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Number of distinct vampire numbers (definition 2) having 2n digits.
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1
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OFFSET
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1,2
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REFERENCES
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C. A. Pickover, "Vampire Numbers." Ch. 30 in Keys to Infinity. New York: Wiley, pp. 227-231, 1995.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,base,hard,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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