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A108116 Base 10 weak Skolem-Langford 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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.

Largest element is a(20120) = 978416154798652002.

REFERENCES

E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 32-35, 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 Skolem-Langford 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

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Last modified February 16 15:17 EST 2020. Contains 331961 sequences. (Running on oeis4.)