cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A239970 Least positive k such that triangular(k) + triangular(n+k) is a triangular number (A000217).

Table of values

n a(n)
0 2
1 5
2 3
3 6
4 9
5 4
6 15
7 18
8 21
9 5
10 27
11 30
12 9
13 36
14 6
15 42
16 10
17 48
18 51
19 14
20 7
21 60
22 63
23 15
24 69
25 72
26 19
27 8
28 81
29 26
30 20
31 13
32 17
33 24
34 99
35 9
36 105
37 14
38 111
39 114
40 29
41 120
42 123
43 126
44 10
45 132
46 135
47 34
48 20
49 144
50 147
51 35
52 153
53 45
54 11
55 29
56 165
57 33
58 17
59 174
60 30
61 44
62 183
63 186
64 189
65 12
66 18
67 23

List of values

[2, 5, 3, 6, 9, 4, 15, 18, 21, 5, 27, 30, 9, 36, 6, 42, 10, 48, 51, 14, 7, 60, 63, 15, 69, 72, 19, 8, 81, 26, 20, 13, 17, 24, 99, 9, 105, 14, 111, 114, 29, 120, 123, 126, 10, 132, 135, 34, 20, 144, 147, 35, 153, 45, 11, 29, 165, 33, 17, 174, 30, 44, 183, 186, 189, 12, 18, 23]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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