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Search: id:A144563
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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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+0
6
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| 1260, 1395, 1530, 6880, 12060, 12550, 12600, 13950, 14350, 15030, 15300, 18270, 21870, 31590, 37840
(list; graph; listen)
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OFFSET
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1,1
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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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The following sequences are all closely related: A020342, A014575, A080718, A048936, A144563.
Sequence in context: A048130 A099592 A014575 this_sequence A158737 A047634 A101469
Adjacent sequences: A144560 A144561 A144562 this_sequence 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 (njas(AT)research.att.com), 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 (mathar(AT)strw.leidenuniv.nl), Jan 05 2009
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