Revision History for A108116
(Underlined text is an addition;
strikethrough text is a deletion.)
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#10 by Nathaniel Johnston at Tue Feb 12 18:18:53 EST 2013
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#9 by Nathaniel Johnston at Tue Feb 12 18:18:51 EST 2013
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| KEYWORD
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base,easy,fini,full,nonn
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| STATUS
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approved
editing
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#8 by Russ Cox at Sat Mar 31 13:46:52 EDT 2012
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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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Discussion
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| Sat Mar 31
| 13:46
| OEIS Server: https://oeis.org/edit/global/891
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#7 by Russ Cox at Fri Mar 30 16:50:17 EDT 2012
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| EXTENSIONS
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Edited by _N. J. A. Sloane (njas(AT)research.att.com), _, Nov 18 2007
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Discussion
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| Fri Mar 30
| 16:50
| OEIS Server: https://oeis.org/edit/global/110
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#6 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010
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| LINKS
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D. Wilson, <a href="="/A108116/b108116.txt">Complete table of n, a(n) for n = 1..20120</a>
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| KEYWORD
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base,easy,fini,nonn,new
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#5 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009
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| LINKS
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D. Wilson, <a href="http://www.research.att.com/~njas/sequences/b108116.txt">Complete table of n, a(n) for n = 1..20120</a>
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| KEYWORD
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base,easy,fini,nonn,new
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| EXTENSIONS
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Edited by N. J. A. Sloane (njas, (AT)research.att.com), Nov 18 2007
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#4 by N. J. A. Sloane at Sun Jun 29 03:00:00 EDT 2008
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| REFERENCES
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E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris.
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| LINKS
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D. Wilson, <a href="http://www.research.att.com/~njas/sequences/b108116.txt"> ">Complete table of n, a(n) for n = 1..20120</a>
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| KEYWORD
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base,easy,fini,nonn,new
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#3 by N. J. A. Sloane at Sun Dec 09 03:00:00 EST 2007
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| NAME
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Base- 10 weak Skolem-Langford numbers.
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| COMMENTS
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Self-describing numbers: Betweenbetween two digits "d" there are d digits.
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| EXAMPLE
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In "2002" there are 2 digits between the two 2's and 0 digitdigits 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.
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| CROSSREFS
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Base- 10 strong Skolem-Langford numbers are in A132291.
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| EXTENSIONS
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Edited by njas, Nov 18 2007
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#2 by N. J. A. Sloane at Sat Nov 10 03:00:00 EST 2007
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| NAME
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AlmostBase-10 Skolem-Langford numbers.
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| DATA
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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
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01,1
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| COMMENTS
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Self-describing numbers: between two digits "d" there are d digits. Almost-Langford numbers have an even number of digits and no two identical pairs of digits. The sequence is finite: what is the last term? Could it be 978416154798652002 ?
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.
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| LINKS
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D. Wilson, <a href="http://www.research.att.com/~njas/sequences/b108116.txt"> Complete table of n, a(n) for n = 1..20120</a>
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| CROSSREFS
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Base-10 strong Skolem-Langford numbers are A132291.
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| KEYWORD
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base,easy,fini,nonn,new
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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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#1 by N. J. A. Sloane at Tue Jul 19 03:00:00 EDT 2005
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| NAME
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Almost-Langford numbers.
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| DATA
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2002, 131003, 231213, 300131, 312132, 420024, 12132003, 14130043, 15120025, 23121300, 23421314, 25121005, 25320035, 30023121, 31213200, 31413004, 34003141, 40031413, 41312432, 45001415, 45121425, 50012152, 51410054
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| OFFSET
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0,1
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| COMMENTS
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Self-describing numbers: between two digits "d" there are d digits. Almost-Langford numbers have an even number of digits and no two identical pairs of digits. The sequence is finite: what is the last term? Could it be 978416154798652002 ?
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| EXAMPLE
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In "2002" there are 2 digits between the two 2's and 0 digit 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.
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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
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| STATUS
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approved
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