OEIS: Difference between revisions

Revision as of 17:46, 4 October 2018

A Handbook of Integer Sequences (Academic Press, New York and London 1973).
Engel expansion - English translation of Friedrich Engel's speech: Entwicklung der Zahlen nach Stammbrüchen. Verhandlungen der 52. Versammlung Deutscher Philologen und Schulmänner, 1913, Marburg, pp. 190-191
WTM World of Terrel Trotter's Math (archive copy of the original webpage of 2004, c.f. his OEIS user page)
Similiar Sequences which have a common subsequence, possibly after some initial values which differ. A pair of sequences is excluded when:
- there is no value >= 100.
- one sequence refers to the other in its name
- the names contain the strings "McKay-Thompson series", " Weyl group " or "Coxeter"

Triangles with interlacing rows, Clark Kimberling's problem no. 18
- Perl and C programs find 1, 2, 20, 1744, 2 002 568, 42 263 042 752 triangles for the between condition
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
A061722, additional CROSSREF A195905
A070165, Collatz conjecture: OEIS/3x+1_Problem (solution proposal)
A095761, clarification
A030707, A055187, A217760 and related sequences
- generalized cumulative counting, Clark Kimberling's problem no. 4
A112273: 5, 15, 365, 945 - a puzzle sequence
- my guess: 5*3^0, 5*3^1, 5*73 (or should that be 315 = 5*7*3^2 ?), 5*7*3^3
A131388, and A131393 with recovered Rule 2
- generalized negative-positive incrementing sequences of Clark Kimberling, with listing and program
A213457 Intertwining numbers: a(8) = 1058349286
A220952: 0, 1, 2, 3, 4, 9, 14, 19, 18, 17, 16, 11, 12, 13, ..., 49 ... by Don Knuth, Feb. 20, 2013, was unkn
- additional FASS curves: space-filling, self-avoiding, simple and self-similar curves
A291939: 1, 12, 19, 27, 37 - overlapping of Collatz sequences, was unkn, with 3D visualization

In 2008 with a semi-automated procedure
Links to papers of N. Gogin and M. Hirvensalo: A052931, A077965,A142995, A142999; Gregory P. Dresden: A003893, A008904, A095877, A095878, A209401; R. Bacher: A060066, A060089, A060111, A060174, A060198; E. Sandifer: A001113 (Feb. 2018)
22 links of Matthieu Latapy (April 2018, repaired by NJAS)
Links to a paper of Manfred Trümper in A238475, A238476, A238477, A239123, A239124, A239126, A239127, A239128, A239129, A240222, A240223 (Sept. 2018)

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 ==''[http://oeis.org 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
 * '''[[OEIS/Engel_expansion|Engel expansion]]''' - English translation of Friedrich Engel's speech: ''Entwicklung der Zahlen nach Stammbrüchen.'' Verhandlungen der 52. Versammlung Deutscher Philologen und Schulmänner, 1913, Marburg, pp. 190-191
 * '''[http://www.teherba.org/trottermath.net WTM]''' World of Terrel Trotter's Math (archive copy of the original webpage of 2004, c.f. his [https://oeis.org/wiki/User:Terrel_Trotter,_Jr. OEIS user page])
+* '''[http://www.teherba.org/fasces/oeis/database/similiar_sequences.html Similiar Sequences]''' which have a common subsequence, possibly after some initial values which differ. A pair of sequences is excluded when:
+** there is no value &gt;= 100.
+** one sequence refers to the other in its name
+** the names contain the strings "McKay-Thompson series", " Weyl group " or "Coxeter"
 ===Work on individual sequences===