A048935 Number of distinct vampire numbers (definition 2) having 2n digits.

0, 7, 148, 3228, 108454, 4390670, 208423682, 11039126154

Offset

1,2

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..8.

Eric Weisstein's World of Mathematics, Vampire Number.

Crossrefs

Cf. A014575, A048938, A048939.

Sequence in context: A251668 A373881 A376227 * A291677 A152552 A349286

Adjacent sequences: A048932 A048933 A048934 * A048936 A048937 A048938

Keyword

nonn,base,hard,more

Author

Eric W. Weisstein

Extensions

More terms from Jens Kruse Andersen, Dec 01 2002

a(8) from Pierro Zachareas, Mar 11 2021

a(8) corrected by Pierro Zachareas, Jul 03 2022

Status

approved