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.

A239071 Numbers k such that k+x+y is a triangular number (A000217), where x and y are the two triangular numbers nearest to k.

Table of values

n a(n)
1 0
2 2
3 6
4 11
5 19
6 39
7 53
8 84
9 104
10 122
11 146
12 195
13 225
14 285
15 321
16 352
17 392
18 434
19 470
20 516
21 605
22 657
23 757
24 815
25 864
26 926
27 990
28 1044
29 1112
30 1241
31 1315
32 1455
33 1535
34 1602
35 1686
36 1844
37 1934
38 2103
39 2199
40 2279
41 2379
42 2481
43 2566
44 2672
45 2870
46 2982
47 3191
48 3309
49 3407
50 3529

List of values

[0, 2, 6, 11, 19, 39, 53, 84, 104, 122, 146, 195, 225, 285, 321, 352, 392, 434, 470, 516, 605, 657, 757, 815, 864, 926, 990, 1044, 1112, 1241, 1315, 1455, 1535, 1602, 1686, 1844, 1934, 2103, 2199, 2279, 2379, 2481, 2566, 2672, 2870, 2982, 3191, 3309, 3407, 3529]

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

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