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.

A131651 Positive integers obtained as the difference of two triangular numbers in exactly 4 ways.

Table of values

n a(n)
1 15
2 21
3 27
4 30
5 33
6 35
7 39
8 42
9 51
10 54
11 55
12 57
13 60
14 65
15 66
16 69
17 70
18 77
19 78
20 84
21 85
22 87
23 91
24 93
25 95
26 102
27 108
28 110
29 111
30 114
31 115
32 119
33 120
34 123
35 125
36 129
37 130
38 132
39 133
40 138
41 140
42 141
43 143
44 145
45 154
46 155
47 156
48 159
49 161
50 168
51 170
52 174
53 177
54 182
55 183
56 185
57 186
58 187

List of values

[15, 21, 27, 30, 33, 35, 39, 42, 51, 54, 55, 57, 60, 65, 66, 69, 70, 77, 78, 84, 85, 87, 91, 93, 95, 102, 108, 110, 111, 114, 115, 119, 120, 123, 125, 129, 130, 132, 133, 138, 140, 141, 143, 145, 154, 155, 156, 159, 161, 168, 170, 174, 177, 182, 183, 185, 186, 187]

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

Content is available under The OEIS End-User License Agreement.