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- Vampire_number abstract "In mathematics, a vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains precisely all the digits from x and from y, in any order, counting multiplicity. x and y are called the fangs.For example: 1260 is a vampire number, with 21 and 60 as fangs, since 21 × 60 = 1260. However, 126000 (which can be expressed as 21 × 6000 or 210 × 600) is not, as 21 and 6000 do not have the correct length, and both 210 and 600 have trailing zeroes. Similarly, 1023 (which can be expressed as 31 × 33) is not, as although 1023 contains all the digits of 31 and 33, the list of digits of the factors does not coincide with the list of digits of the original number.Vampire numbers first appeared in a 1994 post by Clifford A. Pickover to the Usenet group sci.math, and the article he later wrote was published in chapter 30 of his book Keys to Infinity.The vampire numbers are:1260, 1395, 1435, 1530, 1827, 2187, 6880, 102510, 104260, 105210, 105264, 105750, 108135, 110758, 115672, 116725, 117067, 118440, 120600, 123354, 124483, 125248, 125433, 125460, 125500, ... (sequence A014575 in OEIS)There are many known sequences of infinitely many vampire numbers following a pattern, such as: 1530 = 30×51, 150300 = 300×501, 15003000 = 3000×5001, ...".
- Vampire_number wikiPageExternalLink vampire-numbers-visualized.
- Vampire_number wikiPageExternalLink f17b2281a4aa16da?lr=&ie=UTF-8.
- Vampire_number wikiPageExternalLink vampires.
- Vampire_number wikiPageExternalLink puzz_199.htm.
- Vampire_number wikiPageID "924973".
- Vampire_number wikiPageRevisionID "557579341".
- Vampire_number hasPhotoCollection Vampire_number.
- Vampire_number title "Vampire Numbers".
- Vampire_number urlname "VampireNumber".
- Vampire_number subject Category:Base-dependent_integer_sequences.
- Vampire_number type Abstraction100002137.
- Vampire_number type Arrangement107938773.
- Vampire_number type Base-dependentIntegerSequences.
- Vampire_number type Group100031264.
- Vampire_number type Ordering108456993.
- Vampire_number type Sequence108459252.
- Vampire_number type Series108457976.
- Vampire_number comment "In mathematics, a vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains precisely all the digits from x and from y, in any order, counting multiplicity. x and y are called the fangs.For example: 1260 is a vampire number, with 21 and 60 as fangs, since 21 × 60 = 1260.".
- Vampire_number label "Nombre vampire".
- Vampire_number label "Numero del vampiro".
- Vampire_number label "Número vampiro".
- Vampire_number label "Vampire number".
- Vampire_number label "Числа-вампиры".
- Vampire_number label "ヴァンパイア数".
- Vampire_number label "吸血鬼數".
- Vampire_number sameAs Nombre_vampire.
- Vampire_number sameAs Numero_del_vampiro.
- Vampire_number sameAs ヴァンパイア数.
- Vampire_number sameAs Número_vampiro.
- Vampire_number sameAs m.03qf_z.
- Vampire_number sameAs Q2306943.
- Vampire_number sameAs Q2306943.
- Vampire_number sameAs Vampire_number.
- Vampire_number wasDerivedFrom Vampire_number?oldid=557579341.
- Vampire_number isPrimaryTopicOf Vampire_number.