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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; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 1260=21*60=6*210. 1395=5*9*31=15*93. 1530=30*51=3*510.
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CROSSREFS
| The following sequences are all closely related: A020342, A014575, A080718, A048936, A144563.
Sequence in context: A048130 A099592 A014575 * A175746 A179690 A158737
Adjacent sequences: A144560 A144561 A144562 * A144564 A144565 A144566
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KEYWORD
| nonn,base,more
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 03 2009, based on email from Zak Seidov.
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EXTENSIONS
| Corrected A-number in definition. More terms and examples R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 05 2009
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