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A048936
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Subset of A014575 listing numbers which have exactly two such representations of the desired form.
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9
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125460, 11930170, 12054060, 12417993, 12600324, 12827650, 13002462, 22569480, 23287176, 26198073, 26373600, 26839800, 46847920, 61360780, 1001795850, 1013265360, 1017509850, 1018172470, 1044022896, 1047395790
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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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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Table of n, a(n) for n=1..20.
Eric Weisstein's World of Mathematics, Vampire Number.
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EXAMPLE
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125460 = 204*615=246*510
11930170 = 1301*9170=1310*9107
12054060 = 2004*6015=2406*5010
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CROSSREFS
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The following sequences are all closely related: A020342, A014575, A080718, A048936, A144563.
Cf. A014575, A048933, ..., A048939.
Sequence in context: A100406 A183797 A206134 * A224583 A175691 A133220
Adjacent sequences: A048933 A048934 A048935 * A048937 A048938 A048939
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KEYWORD
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nonn,base
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AUTHOR
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Eric W. Weisstein
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EXTENSIONS
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Edited by N. J. A. Sloane, Jan 03 2009
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STATUS
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approved
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