

A144563


Subset of A020342 (vampire numbers, definition 1) listing numbers which have more than one such representation of the desired form.


6



1260, 1395, 1530, 6880, 12060, 12550, 12600, 13950, 14350, 15030, 15300, 18270, 21870, 31590, 37840
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..15.


EXAMPLE

1260 = 21*60 = 6*210. 1395 = 5*9*31 = 15*93. 1530 = 30*51 = 3*510.


CROSSREFS

Closely related: A020342, A014575, A080718, A280928, A048936.
Sequence in context: A099592 A240922 A014575 * A175746 A179690 A158737
Adjacent sequences: A144560 A144561 A144562 * A144564 A144565 A144566


KEYWORD

nonn,base,more


AUTHOR

N. J. A. Sloane, Jan 03 2009, based on email from Zak Seidov


EXTENSIONS

Corrected Anumber in definition. More terms and examples R. J. Mathar, Jan 05 2009


STATUS

approved



