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A144563 Subset of A020342 (vampire numbers, definition 1) listing numbers which have more than one such representation of the desired form. 6

%I

%S 1260,1395,1530,6880,12060,12550,12600,13950,14350,15030,15300,18270,

%T 21870,31590,37840

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

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

%Y Closely related: A020342, A014575, A080718, A280928, A048936.

%K nonn,base,more

%O 1,1

%A _N. J. A. Sloane_, Jan 03 2009, based on email from _Zak Seidov_

%E Corrected A-number in definition. More terms and examples _R. J. Mathar_, Jan 05 2009

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Last modified April 15 13:13 EDT 2021. Contains 342977 sequences. (Running on oeis4.)