A048936 Subset of vampire numbers A014575 having exactly two representations of the desired form.

125460, 11930170, 12054060, 12417993, 12600324, 12827650, 13002462, 22569480, 23287176, 26198073, 26373600, 26839800, 46847920, 61360780, 1001795850, 1013265360, 1017509850, 1018172470, 1044022896, 1047395790

Offset

1,1

References

C. A. Pickover, "Vampire Numbers." Ch. 30 in Keys to Infinity. New York: Wiley, pp. 227-231, 1995.

Links

Table of n, a(n) for n=1..20.

Eric Weisstein's World of Mathematics, Vampire Number.

Example

125460 = 204*615 = 246*510.
11930170 = 1301*9170 = 1310*9107.
12054060 = 2004*6015 = 2406*5010.

Crossrefs

Closely related: A020342, A014575, A080718, A280928, A144563.

Cf. A014575, A048933, ..., A048939.

Sequence in context: A206134 A364126 A237728 * A237066 A224583 A252208

Adjacent sequences: A048933 A048934 A048935 * A048937 A048938 A048939

Keyword

nonn,base,changed

Author

Eric W. Weisstein

Extensions

Edited by N. J. A. Sloane, Jan 03 2009

Name edited by M. F. Hasler, Mar 11 2021

Status

approved