OEIS
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
- 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)
Work on individual sequences
- 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 sequences and graphs
- 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
Broken link repair
- 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 of Manfred Trümper in A238475, A238476, A238477, A239123, A239124, A239126, A239127, A239128, A239129, A240222, A240223 (Sept. 2018)