

A108116


Base 10 weak SkolemLangford numbers.


4



2002, 131003, 231213, 300131, 312132, 420024, 12132003, 14130043, 15120025, 23121300, 23421314, 25121005, 25320035, 30023121, 31213200, 31413004, 34003141, 40031413, 41312432, 45001415, 45121425, 45300435, 50012152, 51410054, 52002151, 52412154, 53002352, 53400354, 61310036
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OFFSET

1,1


COMMENTS

Selfdescribing 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.
Largest element is a(20120) = 978416154798652002.


REFERENCES

E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 3235, Volume 59 (Jeux math'), April/June 2008, Paris.


LINKS

D. Wilson, Complete table of n, a(n) for n = 1..20120


EXAMPLE

In "2002" there are 2 digits between the two 2's and 0 digits between the two 0's; in "131003" there is 1 digit between the two 1's, 3 digits between the two 3's and 0 digit between the two 0's.


CROSSREFS

Base 10 strong SkolemLangford numbers are in A132291.
Sequence in context: A104400 A250880 A154049 * A140920 A162240 A127351
Adjacent sequences: A108113 A108114 A108115 * A108117 A108118 A108119


KEYWORD

base,easy,fini,full,nonn


AUTHOR

Eric Angelini, Jun 26 2005, Aug 10 2007


EXTENSIONS

Edited by N. J. A. Sloane, Nov 18 2007


STATUS

approved



