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.

A256151 Triangular numbers n such that sigma(n) is a square number.

Table of values

n a(n)
1 1
2 3
3 66
4 210
5 820
6 2346
7 4278
8 22578
9 27966
10 32131
11 35511
12 51681
13 53956
14 102378
15 169653
16 173755
17 177906
18 223446
19 241860
20 256686
21 306153
22 310866
23 349866
24 431056
25 434778
26 470935
27 491536
28 512578
29 567645
30 579426
31 688551
32 799480
33 845650
34 893116
35 963966
36 1031766
37 1110795
38 1200475
39 1613706
40 1719585

List of values

[1, 3, 66, 210, 820, 2346, 4278, 22578, 27966, 32131, 35511, 51681, 53956, 102378, 169653, 173755, 177906, 223446, 241860, 256686, 306153, 310866, 349866, 431056, 434778, 470935, 491536, 512578, 567645, 579426, 688551, 799480, 845650, 893116, 963966, 1031766, 1110795, 1200475, 1613706, 1719585]

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

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