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Search: id:A132291
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| A132291 |
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Base 10 strong Skolem-Langford numbers. |
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+0
3
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| 12132003, 23121300, 30023121, 31213200, 1214230043, 1312432004, 2342131400, 2412134003, 3004312142, 3400324121, 4002342131, 4131243200, 1213267345006475, 1213275364005746, 1214267540036573, 1214273645300765, 1214275640035763, 1215247365430076
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Self-describing numbers: between two digits "d" there are d digits.
a(n) has either 0 or 2 instances of any digit, hence even number of digits.
"Strong" means that every digit from 0 to the largest digit of a(n) must be present in a(n).
Number of digits of a(n) == 0 or 2 (mod 8)
Largest element is a(2820) = 867315136875420024.
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LINKS
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D. Wilson, Complete table of n, a(n) for n = 1..2820
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CROSSREFS
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Base 10 Skolem-Langford numbers are in A108116.
Sequence in context: A028241 A123086 A022227 this_sequence A022217 A133373 A077302
Adjacent sequences: A132288 A132289 A132290 this_sequence A132292 A132293 A132294
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KEYWORD
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base,easy,fini,nonn
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AUTHOR
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Eric Angelini (eric.angelini(AT)kntv.be), Jun 26 2005, Aug 10 2007
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EXTENSIONS
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Edited by njas, Nov 18 2007
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