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A048935 Number of distinct vampire numbers (definition 2) having 2n digits. 1
0, 7, 148, 3228, 108454, 4390670, 208423682, 11039125795 (list; graph; refs; listen; history; text; internal format)
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: A342113 A211108 A251668 * A291677 A152552 A308581

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

STATUS

approved

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Last modified October 18 01:39 EDT 2021. Contains 348065 sequences. (Running on oeis4.)