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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.

A152218 Numbers k such that sigma_2(k)*sigma_1(k)/sigma_0(k) is a perfect square.

Table of values

n a(n)
1 1
2 4
3 529
4 2116
5 2583
6 3249
7 3346
8 6150
9 10332
10 12474
11 12792
12 12996
13 28224
14 38240
15 59245
16 85905
17 91035
18 103607
19 142560
20 176382
21 212949
22 236980
23 249744
24 343620
25 360096
26 364140
27 379050
28 414428
29 450840
30 751530
31 787710
32 788424
33 851796
34 1059474
35 1132096
36 1366407

List of values

[1, 4, 529, 2116, 2583, 3249, 3346, 6150, 10332, 12474, 12792, 12996, 28224, 38240, 59245, 85905, 91035, 103607, 142560, 176382, 212949, 236980, 249744, 343620, 360096, 364140, 379050, 414428, 450840, 751530, 787710, 788424, 851796, 1059474, 1132096, 1366407]

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

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