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A144563
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Subset of A020342 (vampire numbers, definition 1) listing numbers which have more than one such representation of the desired form.
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6
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1260, 1395, 1530, 6880, 12060, 12550, 12600, 13950, 14350, 15030, 15300, 18270, 21870, 31590, 37840
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..15.
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EXAMPLE
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1260 = 21*60 = 6*210. 1395 = 5*9*31 = 15*93. 1530 = 30*51 = 3*510.
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CROSSREFS
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Closely related: A020342, A014575, A080718, A280928, A048936.
Sequence in context: A099592 A240922 A014575 * A175746 A291714 A179690
Adjacent sequences: A144560 A144561 A144562 * A144564 A144565 A144566
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KEYWORD
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nonn,base,more
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AUTHOR
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N. J. A. Sloane, Jan 03 2009, based on email from Zak Seidov
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EXTENSIONS
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Corrected A-number in definition. More terms and examples R. J. Mathar, Jan 05 2009
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STATUS
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approved
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