OEIS: Difference between revisions

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A003121
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===Work on individual sequences===
===Work on individual sequences===
* '''[https://oeis.org/A003121 A003121]''' - Triangles with interlacing rows, Clark Kimberling's [http://faculty.evansville.edu/ck6/integer/unsolved.html problem no. 18]
* '''[[OEIS/A003828|A003828]]''', Numbers n such that n^4 is a primitive sum of 3 positive fourth powers: 422481, 2813001, 8707481, 12197457, 16003017, 16430513, 20615673, 44310257, 68711097, 117112081, 145087793, 156646737, 589845921, 638523249, 873822121, 1259768473, 1679142729, 1787882337, 1871713857
* '''[[OEIS/A003828|A003828]]''', Numbers n such that n^4 is a primitive sum of 3 positive fourth powers: 422481, 2813001, 8707481, 12197457, 16003017, 16430513, 20615673, 44310257, 68711097, 117112081, 145087793, 156646737, 589845921, 638523249, 873822121, 1259768473, 1679142729, 1787882337, 1871713857
* '''[https://oeis.org/A131388 A131388], [https://oeis.org/A131393 A131393]''' - negative-positive incrementing sequences
* '''[https://oeis.org/A131388 A131388], [https://oeis.org/A131393 A131393]''' - negative-positive incrementing sequences
* '''[[OEIS/A220952|A220952]]''': 0, 1, 2, 3, 4, 9, 14, 19, 18, 17, 16, 11, 12, 13, ..., 49 ... by Don Knuth, Feb. 20, 2013 (nonn,unkn)
* '''[[OEIS/A220952|A220952]]''': 0, 1, 2, 3, 4, 9, 14, 19, 18, 17, 16, 11, 12, 13, ..., 49 ... by Don Knuth, Feb. 20, 2013 (nonn,unkn)
** Additional '''[[OEIS/FASS_curves|FASS curves]]''': space-'''f'''illing, self-'''a'''voiding, '''s'''imple and self-'''s'''imilar curves
** Additional '''[[OEIS/FASS_curves|FASS curves]]''': space-'''f'''illing, self-'''a'''voiding, '''s'''imple and self-'''s'''imilar curves

Revision as of 20:12, 25 February 2018

The On-Line Encyclopedia of Integer Sequences® of Neil Sloane et al.

  • A Handbook of Integer Sequences (Academic Press, New York and London 1973).
  • Automatic detection and correction of invalid hyperlinks in the OEIS in 2008-2009

Work on individual sequences

  • A003121 - Triangles with interlacing rows, Clark Kimberling's problem no. 18
  • A003828, Numbers n such that n^4 is a primitive sum of 3 positive fourth powers: 422481, 2813001, 8707481, 12197457, 16003017, 16430513, 20615673, 44310257, 68711097, 117112081, 145087793, 156646737, 589845921, 638523249, 873822121, 1259768473, 1679142729, 1787882337, 1871713857
  • A131388, A131393 - negative-positive incrementing sequences
  • A220952: 0, 1, 2, 3, 4, 9, 14, 19, 18, 17, 16, 11, 12, 13, ..., 49 ... by Don Knuth, Feb. 20, 2013 (nonn,unkn)
    • Additional FASS curves: space-filling, self-avoiding, simple and self-similar curves