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

Author

Eric W. Weisstein

Keywords

• nonn
• base

Examples

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

References

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

Links

• Shyam Sunder Gupta, Cab and Vampire Numbers, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 20, 499-512.
• Eric Weisstein's World of Mathematics, Vampire Number.

Crossrefs

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

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

Extensions

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

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