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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.

A274681 Numbers k such that 4*k + 1 is a triangular number.

Table of values

n a(n)
1 0
2 5
3 11
4 26
5 38
6 63
7 81
8 116
9 140
10 185
11 215
12 270
13 306
14 371
15 413
16 488
17 536
18 621
19 675
20 770
21 830
22 935
23 1001
24 1116
25 1188
26 1313
27 1391
28 1526
29 1610
30 1755
31 1845
32 2000
33 2096
34 2261
35 2363
36 2538
37 2646
38 2831
39 2945
40 3140
41 3260
42 3465
43 3591
44 3806
45 3938
46 4163
47 4301
48 4536

List of values

[0, 5, 11, 26, 38, 63, 81, 116, 140, 185, 215, 270, 306, 371, 413, 488, 536, 621, 675, 770, 830, 935, 1001, 1116, 1188, 1313, 1391, 1526, 1610, 1755, 1845, 2000, 2096, 2261, 2363, 2538, 2646, 2831, 2945, 3140, 3260, 3465, 3591, 3806, 3938, 4163, 4301, 4536]

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

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